%% Copyright (c) 2016-2017, Loïc Hoguin %% %% Permission to use, copy, modify, and/or distribute this software for any %% purpose with or without fee is hereby granted, provided that the above %% copyright notice and this permission notice appear in all copies. %% %% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES %% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF %% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR %% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES %% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN %% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF %% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -module(rfc7540_SUITE). -compile(export_all). -compile(nowarn_export_all). -import(ct_helper, [config/2]). -import(ct_helper, [doc/1]). -import(cowboy_test, [gun_open/1]). -import(cowboy_test, [raw_open/1]). -import(cowboy_test, [raw_send/2]). -import(cowboy_test, [raw_recv_head/1]). -import(cowboy_test, [raw_recv/3]). all() -> [{group, clear}, {group, tls}]. groups() -> Modules = ct_helper:all(?MODULE), Clear = [M || M <- Modules, lists:sublist(atom_to_list(M), 4) =/= "alpn"] -- [prior_knowledge_reject_tls], TLS = [M || M <- Modules, lists:sublist(atom_to_list(M), 4) =:= "alpn"] ++ [prior_knowledge_reject_tls], [{clear, [parallel], Clear}, {tls, [parallel], TLS}]. init_per_group(Name = clear, Config) -> cowboy_test:init_http(Name = clear, #{ env => #{dispatch => cowboy_router:compile(init_routes(Config))} }, Config); init_per_group(Name = tls, Config) -> cowboy_test:init_http2(Name = tls, #{ env => #{dispatch => cowboy_router:compile(init_routes(Config))} }, Config). end_per_group(Name, _) -> ok = cowboy:stop_listener(Name). init_routes(_) -> [ {"localhost", [ {"/", hello_h, []}, {"/echo/:key", echo_h, []}, {"/resp/:key[/:arg]", resp_h, []} ]} ]. %% Starting HTTP/2 for "http" URIs. http_upgrade_ignore_h2(Config) -> doc("An h2 token in an Upgrade field must be ignored. (RFC7540 3.2)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 200">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_ignore_if_http_10(Config) -> doc("The Upgrade header must be ignored if part of an HTTP/1.0 request. (RFC7230 6.7)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.0\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 200">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_ignore_missing_upgrade_in_connection(Config) -> doc("The Upgrade header must be listed in the " "Connection header field. (RFC7230 6.7)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 200">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_ignore_missing_http2_settings_in_connection(Config) -> doc("The HTTP2-Settings header must be listed in the " "Connection header field. (RFC7540 3.2.1, RFC7230 6.7)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 200">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_ignore_zero_http2_settings_header(Config) -> doc("The HTTP Upgrade request must include " "exactly one HTTP2-Settings header field (RFC7540 3.2, RFC7540 3.2.1)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "\r\n"]), {ok, <<"HTTP/1.1 200">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_reject_two_http2_settings_header(Config) -> doc("The HTTP Upgrade request must include " "exactly one HTTP2-Settings header field (RFC7540 3.2, RFC7540 3.2.1)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 400">>} = gen_tcp:recv(Socket, 12, 1000), ok. http_upgrade_reject_bad_http2_settings_header(Config) -> doc("The HTTP Upgrade request must include " "a valid HTTP2-Settings header field (RFC7540 3.2, RFC7540 3.2.1)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" %% We send a full SETTINGS frame on purpose. "HTTP2-Settings: ", base64:encode(iolist_to_binary(cow_http2:settings(#{}))), "\r\n", "\r\n"]), {ok, <<"HTTP/1.1 400">>} = gen_tcp:recv(Socket, 12, 1000), ok. %% Match directly for now. do_recv_101(Socket) -> {ok, << "HTTP/1.1 101 Switching Protocols\r\n" "connection: Upgrade\r\n" "upgrade: h2c\r\n" "\r\n" >>} = gen_tcp:recv(Socket, 71, 1000), ok. http_upgrade_101(Config) -> doc("A 101 response must be sent on successful upgrade " "to HTTP/2 when using the HTTP Upgrade mechanism. (RFC7540 3.2, RFC7230 6.7)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), ok. http_upgrade_server_preface(Config) -> doc("The first frame after the upgrade must be a " "SETTINGS frame for the server connection preface. (RFC7540 3.2, RFC7540 3.5, RFC7540 6.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Receive the server preface. {ok, << _:24, 4:8, 0:40 >>} = gen_tcp:recv(Socket, 9, 1000), ok. http_upgrade_client_preface_timeout(Config) -> doc("Clients negotiating HTTP/2 and not sending a preface in " "a timely manner must be disconnected."), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Receive the response to the initial HTTP/1.1 request. {ok, << HeadersSkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, HeadersSkipLen, 1000), {ok, << DataSkipLen:24, 0:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, DataSkipLen, 1000), %% Do not send the preface. Wait for the server to disconnect us. {error, closed} = gen_tcp:recv(Socket, 9, 6000), ok. http_upgrade_reject_missing_client_preface(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.2, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a SETTINGS frame directly instead of the proper preface. ok = gen_tcp:send(Socket, cow_http2:settings(#{})), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. %% The server may however have already started sending the response to the %% initial HTTP/1.1 request. Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc]; {error, _} -> [closed|Acc] end end, [], [1, 2, 3])), case Received of [closed|_] -> ok; [headers, closed|_] -> ok; [headers, data, closed] -> ok end. http_upgrade_reject_invalid_client_preface(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.2, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a slightly incorrect preface. ok = gen_tcp:send(Socket, "PRI * HTTP/2.0\r\n\r\nSM: Value\r\n\r\n"), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. %% The server may however have already started sending the response to the %% initial HTTP/1.1 request. Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc]; {error, _} -> [closed|Acc] end end, [], [1, 2, 3])), case Received of [closed|_] -> ok; [headers, closed|_] -> ok; [headers, data, closed] -> ok end. http_upgrade_reject_missing_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.2, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface sequence except followed by a PING instead of a SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:ping(0)]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. %% The server may however have already started sending the response to the %% initial HTTP/1.1 request. Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc]; {error, _} -> [closed|Acc] end end, [], [1, 2, 3])), case Received of [closed|_] -> ok; [headers, closed|_] -> ok; [headers, data, closed] -> ok end. http_upgrade_reject_invalid_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.2, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface sequence except followed by a badly formed SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", << 0:24, 4:8, 0:9, 1:31 >>]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. %% The server may however have already started sending the response to the %% initial HTTP/1.1 request. Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc]; {error, _} -> [closed|Acc] end end, [], [1, 2, 3])), case Received of [closed|_] -> ok; [headers, closed|_] -> ok; [headers, data, closed] -> ok end. http_upgrade_accept_client_preface_empty_settings(Config) -> doc("The SETTINGS frame in the client preface may be empty. (RFC7540 3.2, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface sequence except followed by an empty SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), ok. http_upgrade_client_preface_settings_ack_timeout(Config) -> doc("The SETTINGS frames sent by the client must be acknowledged. (RFC7540 3.5, RFC7540 6.5.3)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Do not ack the server preface. Expect a GOAWAY with reason SETTINGS_TIMEOUT. {ok, << _:24, 7:8, _:72, 4:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% @todo We need a successful test with actual options in HTTP2-Settings. %% SETTINGS_MAX_FRAME_SIZE is probably the easiest to test. The relevant %% RFC quote is: %% %% 3.2.1 %% A server decodes and interprets these values as it would any other %% SETTINGS frame. Explicit acknowledgement of these settings %% (Section 6.5.3) is not necessary, since a 101 response serves as %% implicit acknowledgement. %% @todo We need to test an upgrade with a request body. It is probably %% worth having a configuration value for how much we accept while still %% upgrading (if too big, we would just stay on HTTP/1.1). We therefore %% needs a test for when the body is small enough, and one for when the %% body is larger than we accept. The relevant RFC quote is: %% %% 3.2 %% Requests that contain a payload body MUST be sent in their entirety %% before the client can send HTTP/2 frames. This means that a large %% request can block the use of the connection until it is completely %% sent. %% @todo We should definitely have a test with OPTIONS. The relevant %% RFC quote is: %% %% 3.2 %% If concurrency of an initial request with subsequent requests is %% important, an OPTIONS request can be used to perform the upgrade to %% HTTP/2, at the cost of an additional round trip. %% @todo If we ever handle priority, we need to check that the initial %% HTTP/1.1 request has default priority. The relevant RFC quote is: %% %% 3.2 %% The HTTP/1.1 request that is sent prior to upgrade is assigned a %% stream identifier of 1 (see Section 5.1.1) with default priority %% values (Section 5.3.5). http_upgrade_response(Config) -> doc("A response must be sent to the initial HTTP/1.1 request " "after switching to HTTP/2. The response must use " "the stream identifier 1. (RFC7540 3.2)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface. %% @todo Use non-empty SETTINGS here. Just because. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Send the SETTINGS ack. ok = gen_tcp:send(Socket, cow_http2:settings_ack()), %% Receive the SETTINGS ack, and the response HEADERS and DATA (Stream ID 1). Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << 0:24, 4:8, 1:8, 0:32 >>} -> [settings_ack|Acc]; {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc] end end, [], [1, 2, 3])), case Received of [settings_ack, headers, data] -> ok; [headers, settings_ack, data] -> ok; [headers, data, settings_ack] -> ok end. http_upgrade_response_half_closed(Config) -> doc("The stream for the initial HTTP/1.1 request is half-closed. (RFC7540 3.2)"), %% Try sending more data after the upgrade and get an error. {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface followed by an unexpected DATA frame. ok = gen_tcp:send(Socket, [ "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{}), cow_http2:data(1, fin, <<"Unexpected DATA frame.">>) ]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Skip the SETTINGS ack, receive the response HEADERS, DATA and RST_STREAM (streamid 1). Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << 0:24, 4:8, 1:8, 0:32 >>} -> Acc; {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc]; {ok, << 4:24, 3:8, 0:8, 1:32 >>} -> %% We expect a STREAM_CLOSED reason. {ok, << 5:32 >>} = gen_tcp:recv(Socket, 4, 1000), [rst_stream|Acc]; {error, _} -> %% Can be timeouts, ignore them. Acc end end, [], [1, 2, 3, 4])), case Received of [rst_stream] -> ok; [headers, rst_stream] -> ok; [headers, data, rst_stream] -> ok end. %% Starting HTTP/2 for "https" URIs. alpn_ignore_h2c(Config) -> doc("An h2c ALPN protocol identifier must be ignored. (RFC7540 3.3)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2c">>, <<"http/1.1">>]}, binary, {active, false}]), {ok, <<"http/1.1">>} = ssl:negotiated_protocol(Socket), ok. alpn_server_preface(Config) -> doc("The first frame must be a SETTINGS frame " "for the server connection preface. (RFC7540 3.3, RFC7540 3.5, RFC7540 6.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Receive the server preface. {ok, << _:24, 4:8, 0:40 >>} = ssl:recv(Socket, 9, 1000), ok. alpn_client_preface_timeout(Config) -> doc("Clients negotiating HTTP/2 and not sending a preface in " "a timely manner must be disconnected."), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% Do not send the preface. Wait for the server to disconnect us. {error, closed} = ssl:recv(Socket, 3, 6000), ok. alpn_reject_missing_client_preface(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.3, RFC7540 3.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a SETTINGS frame directly instead of the proper preface. ok = ssl:send(Socket, cow_http2:settings(#{})), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = ssl:recv(Socket, 3, 1000), ok. alpn_reject_invalid_client_preface(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.3, RFC7540 3.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a slightly incorrect preface. ok = ssl:send(Socket, "PRI * HTTP/2.0\r\n\r\nSM: Value\r\n\r\n"), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = ssl:recv(Socket, 3, 1000), ok. alpn_reject_missing_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.3, RFC7540 3.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a valid preface sequence except followed by a PING instead of a SETTINGS frame. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:ping(0)]), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = ssl:recv(Socket, 3, 1000), ok. alpn_reject_invalid_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.3, RFC7540 3.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a valid preface sequence except followed by a badly formed SETTINGS frame. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", << 0:24, 4:8, 0:9, 1:31 >>]), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = ssl:recv(Socket, 3, 1000), ok. alpn_accept_client_preface_empty_settings(Config) -> doc("The SETTINGS frame in the client preface may be empty. (RFC7540 3.3, RFC7540 3.5)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a valid preface sequence except followed by an empty SETTINGS frame. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = ssl:recv(Socket, 9, 1000), ok. alpn_client_preface_settings_ack_timeout(Config) -> doc("Failure to acknowledge the server's SETTINGS frame " "results in a SETTINGS_TIMEOUT connection error. (RFC7540 3.5, RFC7540 6.5.3)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a valid preface. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = ssl:recv(Socket, 9, 1000), %% Do not ack the server preface. Expect a GOAWAY with reason SETTINGS_TIMEOUT. {ok, << _:24, 7:8, _:72, 4:32 >>} = ssl:recv(Socket, 17, 6000), ok. alpn(Config) -> doc("Successful ALPN negotiation. (RFC7540 3.3)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [{alpn_advertised_protocols, [<<"h2">>]}, binary, {active, false}]), {ok, <<"h2">>} = ssl:negotiated_protocol(Socket), %% Send a valid preface. %% @todo Use non-empty SETTINGS here. Just because. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = ssl:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = ssl:recv(Socket, 6 + Len, 1000), %% Send the SETTINGS ack. ok = ssl:send(Socket, cow_http2:settings_ack()), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = ssl:recv(Socket, 9, 1000), %% Wait until after the SETTINGS ack timeout was supposed to trigger. receive after 6000 -> ok end, %% Send a PING. ok = ssl:send(Socket, cow_http2:ping(0)), %% Receive a PING ack back, indicating the connection is still up. {ok, << 8:24, 6:8, 0:7, 1:1, 0:96 >>} = ssl:recv(Socket, 17, 1000), ok. %% Starting HTTP/2 with prior knowledge. prior_knowledge_reject_tls(Config) -> doc("Implementations that support HTTP/2 over TLS must use ALPN. (RFC7540 3.4)"), {ok, Socket} = ssl:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface. ok = ssl:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% We expect the server to send an HTTP 400 error %% when trying to use HTTP/2 without going through ALPN negotiation. {ok, <<"HTTP/1.1 400">>} = ssl:recv(Socket, 12, 1000), ok. prior_knowledge_server_preface(Config) -> doc("The first frame must be a SETTINGS frame " "for the server connection preface. (RFC7540 3.4, RFC7540 3.5, RFC7540 6.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << _:24, 4:8, 0:40 >>} = gen_tcp:recv(Socket, 9, 1000), ok. %% Note: the client preface timeout doesn't apply in this case, %% so we don't test it. An HTTP/1.1 client that does not send %% a request in a timely manner will get disconnected by the %% HTTP protocol code, not by HTTP/2's. %% Note: the test that starts by sending a SETTINGS frame is %% redundant with tests sending garbage on the connection. %% From the point of view of an HTTP/1.1 connection, a %% SETTINGS frame is indistinguishable from garbage. prior_knowledge_reject_invalid_client_preface(Config) -> doc("An incorrect preface is an invalid HTTP/1.1 request. (RFC7540 3.4)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a slightly incorrect preface. ok = gen_tcp:send(Socket, "PRI * HTTP/2.0\r\n\r\nSM: Value\r\n\r\n"), %% We propagate to HTTP/2 after checking only the request-line. %% The server then sends its preface before checking the full client preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = gen_tcp:recv(Socket, 9, 1000), ok. prior_knowledge_reject_missing_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.4, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface sequence except followed by a PING instead of a SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:ping(0)]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = gen_tcp:recv(Socket, 9, 1000), ok. prior_knowledge_reject_invalid_client_preface_settings(Config) -> doc("Servers must treat an invalid connection preface as a " "connection error of type PROTOCOL_ERROR. (RFC7540 3.4, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface sequence except followed by a badly formed SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", << 0:24, 4:8, 0:9, 1:31 >>]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% We expect the server to close the connection when it receives a bad preface. {error, closed} = gen_tcp:recv(Socket, 9, 1000), ok. prior_knowledge_accept_client_preface_empty_settings(Config) -> doc("The SETTINGS frame in the client preface may be empty. (RFC7540 3.4, RFC7540 3.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface sequence except followed by an empty SETTINGS frame. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), ok. prior_knowledge_client_preface_settings_ack_timeout(Config) -> doc("The SETTINGS frames sent by the client must be acknowledged. (RFC7540 3.5, RFC7540 6.5.3)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Do not ack the server preface. Expect a GOAWAY with reason SETTINGS_TIMEOUT. {ok, << _:24, 7:8, _:72, 4:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% Do a prior knowledge handshake. do_handshake(Config) -> {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Send the SETTINGS ack. ok = gen_tcp:send(Socket, cow_http2:settings_ack()), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, Socket}. prior_knowledge(Config) -> doc("Streams can be initiated after a successful HTTP/2 connection " "with prior knowledge of server capabilities. (RFC7540 3.4)"), %% @todo Use non-empty SETTINGS here. Just because. {ok, Socket} = do_handshake(Config), %% Wait until after the SETTINGS ack timeout was supposed to trigger. receive after 6000 -> ok end, %% Send a PING. ok = gen_tcp:send(Socket, cow_http2:ping(0)), %% Receive a PING ack back, indicating the connection is still up. {ok, << 8:24, 6:8, 0:7, 1:1, 0:96 >>} = gen_tcp:recv(Socket, 17, 1000), ok. %% @todo If we ever add an option to disable HTTP/2, we need to check %% the following things: %% * HTTP/1.1 Upgrade returns an HTTP/1.1 response (3.2) %% * HTTP/1.1 Upgrade errors out if the client sends HTTP/2 frames %% without waiting for the 101 response (3.2, 3.5) %% * Prior knowledge handshake fails (3.4) %% * ALPN selects HTTP/1.1 (3.3) %% Frame format. ignore_unknown_frames(Config) -> doc("Frames of unknown type must be ignored and discarded. (RFC7540 4.1)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a single DATA frame, %% and an unknown frame type interleaved. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 10:24, 99:8, 0:40, 0:80 >>, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_data_unknown_flags(Config) -> doc("Undefined DATA frame flags must be ignored. (RFC7540 4.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a DATA frame with unknown flags. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 100:24, 0:8, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, %% PADDED. 1:1, 1:1, %% Undefined. 1:1, %% END_STREAM. 0:1, 1:31, 0:100/unit:8 >> ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_headers_unknown_flags(Config) -> doc("Undefined HEADERS frame flags must be ignored. (RFC7540 4.1, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a HEADERS frame with unknown flags. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), Len = iolist_size(HeadersBlock), ok = gen_tcp:send(Socket, [ << Len:24, 1:8, 1:1, 1:1, %% Undefined. 0:1, %% PRIORITY. 1:1, %% Undefined. 0:1, %% PADDED. 1:1, %% END_HEADERS. 1:1, %% Undefined. 0:1, %% END_STREAM. 0:1, 1:31 >>, HeadersBlock, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_priority_unknown_flags(Config) -> doc("Undefined PRIORITY frame flags must be ignored. (RFC7540 4.1, RFC7540 6.3)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with an interleaved PRIORITY frame with unknown flags. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 5:24, 2:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, 1:31, 0:1, 3:31, 0:8 >>, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_rst_stream_unknown_flags(Config) -> doc("Undefined RST_STREAM frame flags must be ignored. (RFC7540 4.1, RFC7540 6.4)"), {ok, Socket} = do_handshake(Config), %% Send a POST request then cancel it with an RST_STREAM frame with unknown flags. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 4:24, 3:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, 1:31, 8:32 >>, cow_http2:headers(3, nofin, HeadersBlock), cow_http2:data(3, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 3:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 3:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_settings_unknown_flags(Config) -> doc("Undefined SETTINGS frame flags must be ignored. (RFC7540 4.1, RFC7540 6.5)"), {ok, Socket} = do_handshake(Config), %% Send a SETTINGS frame with unknown flags. ok = gen_tcp:send(Socket, << 6:24, 4:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, %% ACK. 0:32, 2:16, 0:32 >>), %% Receive a SETTINGS ack. {ok, << 0:24, 4:8, 0:7, 1:1, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), ok. ignore_push_promise_unknown_flags(Config) -> doc("Undefined PUSH_PROMISE frame flags must be ignored. (RFC7540 4.1, RFC7540 6.6)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame with unknown flags. ok = gen_tcp:send(Socket, << 4:24, 5:8, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, %% PADDED. 1:1, %% END_HEADERS. 1:1, 1:1, %% Undefined. 0:1, 1:31, 0:1, 3:31 >> ), %% Receive a PROTOCOL_ERROR connection error. %% %% Note that it is not possible to distinguish between the expected %% result and the server rejecting PUSH_PROMISE frames. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_ping_unknown_flags(Config) -> doc("Undefined PING frame flags must be ignored. (RFC7540 4.1, RFC7540 6.7)"), {ok, Socket} = do_handshake(Config), %% Send a PING frame with unknown flags. ok = gen_tcp:send(Socket, << 8:24, 6:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:1, %% ACK. 0:32, 0:64 >>), %% Receive a PING ACK in return. {ok, << 8:24, 6:8, _:7, 1:1, _:32, 0:64 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_goaway_unknown_flags(Config) -> doc("Undefined GOAWAY frame flags must be ignored. (RFC7540 4.1, RFC7540 6.8)"), {ok, Socket} = do_handshake(Config), %% Send a GOAWAY frame with unknown flags. ok = gen_tcp:send(Socket, << 8:24, 7:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:32, 0:64 >>), %% Receive a GOAWAY frame back. {ok, << _:24, 7:8, _:72, 0:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_window_update_unknown_flags(Config) -> doc("Undefined WINDOW_UPDATE frame flags must be ignored. (RFC7540 4.1, RFC7540 6.9)"), {ok, Socket} = do_handshake(Config), %% Send a WINDOW_UPDATE frame with unknown flags. ok = gen_tcp:send(Socket, << 4:24, 8:8, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 0:32, 1000:32 >>), %% We expect no errors or replies, therefore we send a PING frame. ok = gen_tcp:send(Socket, cow_http2:ping(0)), %% And receive a PING ACK in return. {ok, << 8:24, 6:8, _:7, 1:1, _:32, 0:64 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_continuation_unknown_flags(Config) -> doc("Undefined CONTINUATION frame flags must be ignored. (RFC7540 4.1, RFC7540 6.10)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a CONTINUATION frame with unknown flags. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), Len = iolist_size(HeadersBlock), ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:8, 0:1, 1:31 >>, << Len:24, 9:8, 1:1, 1:1, 1:1, 1:1, 1:1, %% Undefined. 1:1, %% END_HEADERS. 1:1, 1:1, %% Undefined. 0:1, 1:31 >>, HeadersBlock, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. %% @todo Flags that have no defined semantics for %% a particular frame type MUST be left unset (0x0) when sending. (RFC7540 4.1) ignore_data_reserved_bit(Config) -> doc("Reserved 1-bit field of DATA frame must be ignored. (RFC7540 4.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a DATA frame with the reserved bit set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 100:24, 0:8, 0:7, 1:1, 1:1, %% Reserved bit. 1:31, 0:100/unit:8 >> ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_headers_reserved_bit(Config) -> doc("Reserved 1-bit field of HEADERS frame must be ignored. (RFC7540 4.1, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a HEADERS frame with the reserved bit set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), Len = iolist_size(HeadersBlock), ok = gen_tcp:send(Socket, [ << Len:24, 1:8, 0:5, 1:1, 0:2, 1:1, %% Reserved bit. 1:31 >>, HeadersBlock, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_priority_reserved_bit(Config) -> doc("Reserved 1-bit field of PRIORITY frame must be ignored. (RFC7540 4.1, RFC7540 6.3)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with an interleaved PRIORITY frame with the reserved bit set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 5:24, 2:8, 0:8, 1:1, %% Reserved bit. 1:31, 0:1, 3:31, 0:8 >>, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_rst_stream_reserved_bit(Config) -> doc("Reserved 1-bit field of RST_STREAM frame must be ignored. (RFC7540 4.1, RFC7540 6.4)"), {ok, Socket} = do_handshake(Config), %% Send a POST request then cancel it with an RST_STREAM frame with the reserved bit set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 4:24, 3:8, 0:8, 1:1, %% Reserved bit. 1:31, 8:32 >>, cow_http2:headers(3, nofin, HeadersBlock), cow_http2:data(3, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 3:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 3:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. ignore_settings_reserved_bit(Config) -> doc("Reserved 1-bit field of SETTINGS frame must be ignored. (RFC7540 4.1, RFC7540 6.5)"), {ok, Socket} = do_handshake(Config), %% Send a SETTINGS frame with the reserved bit set. ok = gen_tcp:send(Socket, << 6:24, 4:8, 0:8, 1:1, %% Reserved bit. 0:31, 2:16, 0:32 >>), %% Receive a SETTINGS ack. {ok, << 0:24, 4:8, 0:7, 1:1, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), ok. ignore_push_promise_reserved_bit(Config) -> doc("Reserved 1-bit field of PUSH_PROMISE frame must be ignored. (RFC7540 4.1, RFC7540 6.6)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame with the reserved bit set. ok = gen_tcp:send(Socket, << 4:24, 5:8, 0:5, 1:1, 0:2, 1:1, %% Reserved bit. 1:31, 0:1, 3:31 >> ), %% Receive a PROTOCOL_ERROR connection error. %% %% Note that it is not possible to distinguish between the expected %% result and the server rejecting PUSH_PROMISE frames. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_ping_reserved_bit(Config) -> doc("Reserved 1-bit field of PING frame must be ignored. (RFC7540 4.1, RFC7540 6.7)"), {ok, Socket} = do_handshake(Config), %% Send a PING frame with the reserved bit set. ok = gen_tcp:send(Socket, << 8:24, 6:8, 0:8, 1:1, %% Reserved bit. 0:31, 0:64 >>), %% Receive a PING ACK in return. {ok, << 8:24, 6:8, _:7, 1:1, _:32, 0:64 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_goaway_reserved_bit(Config) -> doc("Reserved 1-bit field of GOAWAY frame must be ignored. (RFC7540 4.1, RFC7540 6.8)"), {ok, Socket} = do_handshake(Config), %% Send a GOAWAY frame with the reserved bit set. ok = gen_tcp:send(Socket, << 8:24, 7:8, 0:8, 1:1, %% Reserved bit. 0:31, 0:64 >>), %% Receive a GOAWAY frame back. {ok, << _:24, 7:8, _:72, 0:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_window_update_reserved_bit(Config) -> doc("Reserved 1-bit field of WINDOW_UPDATE frame must be ignored. (RFC7540 4.1, RFC7540 6.9)"), {ok, Socket} = do_handshake(Config), %% Send a WINDOW_UPDATE frame with the reserved bit set. ok = gen_tcp:send(Socket, << 4:24, 8:8, 0:8, 1:1, %% Reserved bit. 0:31, 1000:32 >>), %% We expect no errors or replies, therefore we send a PING frame. ok = gen_tcp:send(Socket, cow_http2:ping(0)), %% And receive a PING ACK in return. {ok, << 8:24, 6:8, _:7, 1:1, _:32, 0:64 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ignore_continuation_reserved_bit(Config) -> doc("Reserved 1-bit field of CONTINUATION frame must be ignored. (RFC7540 4.1, RFC7540 6.10)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a CONTINUATION frame with the reserved bit set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), Len = iolist_size(HeadersBlock), ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:8, 0:1, 1:31 >>, << Len:24, 9:8, 0:5, 1:1, 0:2, 1:1, %% Reserved bit. 1:31 >>, HeadersBlock, cow_http2:data(1, fin, << 0:100/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 100:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:100/unit:8 >>} = gen_tcp:recv(Socket, 100, 1000), ok. %% @todo The reserved 1-bit field MUST remain unset (0x0) when sending. (RFC7540 4.1) %% Frame size. max_frame_size_allow_exactly_default(Config) -> doc("All implementations must allow frame sizes of at least 16384. (RFC7540 4.1, RFC7540 4.2)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a DATA frame of exactly 16384 bytes. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), cow_http2:data(1, fin, << 0:16384/unit:8 >>) ]), %% Receive a response with the same DATA frame. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = case gen_tcp:recv(Socket, 9, 1000) of %% We received a WINDOW_UPDATE first. Skip it and the next. {ok, <<4:24, 8:8, 0:40>>} -> {ok, _} = gen_tcp:recv(Socket, 4 + 13, 1000), gen_tcp:recv(Socket, 9, 1000); Res -> Res end, {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 16384:24, 0:8, 1:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, << 0:16384/unit:8 >>} = gen_tcp:recv(Socket, 16384, 1000), ok. max_frame_size_reject_larger_than_default(Config) -> doc("A FRAME_SIZE_ERROR connection error must be sent when receiving " "frames larger than the default 16384 length. (RFC7540 4.1, RFC7540 4.2)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with a DATA frame larger than 16384 bytes. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), cow_http2:data(1, fin, << 0:16385/unit:8 >>) ]), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% @todo We need configurable SETTINGS in Cowboy for these tests. %% max_frame_size_config_reject_too_small(Config) -> %% doc("SETTINGS_MAX_FRAME_SIZE configuration values smaller than " %% "16384 must be rejected. (RFC7540 6.5.2)"), %% %% @todo This requires us to have a configurable SETTINGS in Cowboy. %% todo. %% %% max_frame_size_config_reject_too_large(Config) -> %% doc("SETTINGS_MAX_FRAME_SIZE configuration values larger than " %% "16777215 must be rejected. (RFC7540 6.5.2)"), %% %% @todo This requires us to have a configurable SETTINGS in Cowboy. %% todo. %% %% max_frame_size_allow_exactly_custom(Config) -> %% doc("An endpoint that sets SETTINGS_MAX_FRAME_SIZE must allow frames " %% "of up to that size. (RFC7540 4.2, RFC7540 6.5.2)"), %% %% @todo This requires us to have a configurable SETTINGS in Cowboy. %% todo. %% %% max_frame_size_reject_larger_than_custom(Config) -> %% doc("An endpoint that sets SETTINGS_MAX_FRAME_SIZE must reject frames " %% "of up to that size with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.5.2)"), %% %% @todo This requires us to have a configurable SETTINGS in Cowboy. %% todo. %% @todo How do I test this? %% %% max_frame_size_client_default_respect_limits(Config) -> %% doc("The server must not send frame sizes of more " %% "than 16384 by default. (RFC7540 4.1, RFC7540 4.2)"), %% This is about the client sending a SETTINGS frame. max_frame_size_client_override_reject_too_small(Config) -> doc("A SETTINGS_MAX_FRAME_SIZE smaller than 16384 must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 6.5.2)"), {ok, Socket} = do_handshake(Config), %% Send a SETTINGS frame with a SETTINGS_MAX_FRAME_SIZE lower than 16384. ok = gen_tcp:send(Socket, << 6:24, 4:8, 0:40, 5:16, 16383:32 >>), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% This is about the client sending a SETTINGS frame. max_frame_size_client_override_reject_too_large(Config) -> doc("A SETTINGS_MAX_FRAME_SIZE larger than 16777215 must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 6.5.2)"), {ok, Socket} = do_handshake(Config), %% Send a SETTINGS frame with a SETTINGS_MAX_FRAME_SIZE larger than 16777215. ok = gen_tcp:send(Socket, << 6:24, 4:8, 0:40, 5:16, 16777216:32 >>), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% @todo How do I test this? %% %% max_frame_size_client_custom_respect_limits(Config) -> %% doc("The server must not send frame sizes of more than " %% "client's advertised limits. (RFC7540 4.1, RFC7540 4.2)"), %% I am using FRAME_SIZE_ERROR here because the information in the %% frame header tells us this frame is at least 1 byte long, while %% the given length is smaller; i.e. it is too small to contain %% mandatory frame data (the pad length). data_reject_frame_size_0_padded_flag(Config) -> doc("DATA frames of size 0 with the PADDED flag set must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with an incorrect padded DATA frame size. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 0:24, 0:8, 0:4, 1:1, 0:2, 1:1, 0:1, 1:31 >> ]), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% This case on the other hand is noted specifically in the RFC %% as being a PROTOCOL_ERROR. It can be thought of as the Pad Length %% being incorrect, rather than the frame size. data_reject_frame_size_too_small_padded_flag(Config) -> doc("DATA frames with Pad Length >= Length must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a POST request with an incorrect padded DATA frame size. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"POST">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/echo/read_body">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, nofin, HeadersBlock), << 10:24, 0:8, 0:4, 1:1, 0:2, 1:1, 0:1, 1:31, 10:8, 0:80 >> ]), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. headers_reject_frame_size_0_padded_flag(Config) -> doc("HEADERS frames of size 0 with the PADDED flag set must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a padded HEADERS frame with an incorrect size. ok = gen_tcp:send(Socket, << 0:24, 1:8, 0:4, 1:1, 0:2, 1:1, 0:1, 1:31 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. headers_reject_frame_size_too_small_padded_flag(Config) -> doc("HEADERS frames with no priority flag and Pad Length >= Length " "must be rejected with a PROTOCOL_ERROR connection error. (RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a padded HEADERS frame with an incorrect size. ok = gen_tcp:send(Socket, << 10:24, 1:8, 0:4, 1:1, 0:2, 1:1, 0:1, 1:31, 10:8, 0:80 >>), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. headers_reject_frame_size_too_small_priority_flag(Config) -> doc("HEADERS frames of size smaller than 5 with the PRIORITY flag set must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with priority set and an incorrect size. ok = gen_tcp:send(Socket, << 4:24, 1:8, 0:2, 1:1, 0:4, 1:1, 0:1, 1:31, 0:1, 3:31, 0:8 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. headers_reject_frame_size_5_padded_and_priority_flags(Config) -> doc("HEADERS frames of size smaller than 6 with the PADDED " "and PRIORITY flags set must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a padded HEADERS frame with an incorrect size. ok = gen_tcp:send(Socket, << 5:24, 1:8, 0:2, 1:1, 0:1, 1:1, 0:2, 1:1, 0:1, 1:31, 0:8, 0:1, 3:31, 0:8 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. headers_reject_frame_size_too_small_padded_and_priority_flags(Config) -> doc("HEADERS frames of size smaller than Length+6 with the PADDED and PRIORITY flags set " "must be rejected with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a padded HEADERS frame with an incorrect size. ok = gen_tcp:send(Socket, << 15:24, 1:8, 0:2, 1:1, 0:1, 1:1, 0:2, 1:1, 0:1, 1:31, 10:8, 0:1, 3:31, 0:8, 0:80 >>), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. priority_reject_frame_size_too_small(Config) -> doc("PRIORITY frames of size smaller than 5 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.3)"), {ok, Socket} = do_handshake(Config), %% Send a PRIORITY frame with an incorrect size. ok = gen_tcp:send(Socket, << 4:24, 2:8, 0:9, 1:31, 0:1, 3:31, 0:8 >>), %% Receive a FRAME_SIZE_ERROR stream error. {ok, << _:24, 3:8, _:40, 6:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. priority_reject_frame_size_too_large(Config) -> doc("PRIORITY frames of size larger than 5 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.3)"), {ok, Socket} = do_handshake(Config), %% Send a PRIORITY frame with an incorrect size. ok = gen_tcp:send(Socket, << 6:24, 2:8, 0:9, 1:31, 0:1, 3:31, 0:16 >>), %% Receive a FRAME_SIZE_ERROR stream error. {ok, << _:24, 3:8, _:40, 6:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. rst_stream_reject_frame_size_too_small(Config) -> doc("RST_STREAM frames of size smaller than 4 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.4)"), {ok, Socket} = do_handshake(Config), %% Send a request and reset it immediately. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, fin, HeadersBlock), << 3:24, 3:8, 0:9, 1:31, 8:32 >> ]), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. rst_stream_reject_frame_size_too_large(Config) -> doc("RST_STREAM frames of size larger than 4 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.4)"), {ok, Socket} = do_handshake(Config), %% Send a request and reset it immediately. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, fin, HeadersBlock), << 5:24, 3:8, 0:9, 1:31, 8:32 >> ]), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. settings_reject_bad_frame_size(Config) -> doc("SETTINGS frames must have a size multiple of 6 or be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.5)"), {ok, Socket} = do_handshake(Config), %% Send a SETTINGS frame with an incorrect size. ok = gen_tcp:send(Socket, << 5:24, 4:8, 0:40, 1:16, 4096:32 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. settings_ack_reject_non_empty_frame_size(Config) -> doc("SETTINGS frames with the ACK flag set and a non-empty payload " "must be rejected with a FRAME_SIZE_ERROR connection error (RFC7540 4.2, RFC7540 6.5)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Send a SETTINGS ack with a payload. ok = gen_tcp:send(Socket, << 6:24, 4:8, 0:7, 1:1, 0:32, 1:16, 4096:32 >>), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% Note that clients are not supposed to send PUSH_PROMISE frames. %% However when they do, we need to be able to parse it in order %% to reject it, and so these errors may still occur. push_promise_reject_frame_size_too_small(Config) -> doc("PUSH_PROMISE frames of size smaller than 4 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.6)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame with an incorrect size. ok = gen_tcp:send(Socket, << 3:24, 5:8, 0:5, 1:1, 0:3, 1:31, 0:1, 3:31 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. push_promise_reject_frame_size_4_padded_flag(Config) -> doc("PUSH_PROMISE frames of size smaller than 5 with the PADDED flag set must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.6)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame with an incorrect size. ok = gen_tcp:send(Socket, << 4:24, 5:8, 0:4, 1:1, 1:1, 0:3, 1:31, 0:1, 0:8, 3:31 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. push_promise_reject_frame_size_too_small_padded_flag(Config) -> doc("PUSH_PROMISE frames of size smaller than Length+5 with the PADDED flag set " "must be rejected with a PROTOCOL_ERROR connection error. (RFC7540 4.2, RFC7540 6.6)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame with an incorrect size. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), Len = 14 + iolist_size(HeadersBlock), ok = gen_tcp:send(Socket, [ << Len:24, 5:8, 0:4, 1:1, 1:1, 0:3, 1:31, 10:8, 0:1, 3:31 >>, HeadersBlock, << 0:80 >> ]), %% Receive a PROTOCOL_ERROR connection error. %% %% Note that it is not possible to distinguish between a Pad Length %% error and the server rejecting PUSH_PROMISE frames. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ping_reject_frame_size_too_small(Config) -> doc("PING frames of size smaller than 8 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.7)"), {ok, Socket} = do_handshake(Config), %% Send a PING frame with an incorrect size. ok = gen_tcp:send(Socket, << 7:24, 6:8, 0:40, 0:56 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. ping_reject_frame_size_too_large(Config) -> doc("PING frames of size larger than 8 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.7)"), {ok, Socket} = do_handshake(Config), %% Send a PING frame with an incorrect size. ok = gen_tcp:send(Socket, << 9:24, 6:8, 0:40, 0:72 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. goaway_reject_frame_size_too_small(Config) -> doc("GOAWAY frames of size smaller than 8 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.8)"), {ok, Socket} = do_handshake(Config), %% Send a GOAWAY frame with an incorrect size. ok = gen_tcp:send(Socket, << 7:24, 7:8, 0:40, 0:56 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. goaway_allow_frame_size_too_large(Config) -> doc("GOAWAY frames of size larger than 8 must be allowed. (RFC7540 6.8)"), {ok, Socket} = do_handshake(Config), %% Send a GOAWAY frame with debug data. ok = gen_tcp:send(Socket, << 12:24, 7:8, 0:40, 0:64, 99999:32 >>), %% Receive a GOAWAY frame back. {ok, << _:24, 7:8, _:72, 0:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. window_update_reject_frame_size_too_small(Config) -> doc("WINDOW_UPDATE frames of size smaller than 4 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.9)"), {ok, Socket} = do_handshake(Config), %% Send a WINDOW_UPDATE frame with an incorrect size. ok = gen_tcp:send(Socket, << 3:24, 8:8, 0:40, 1000:24 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. window_update_reject_frame_size_too_large(Config) -> doc("WINDOW_UPDATE frames of size larger than 4 must be rejected " "with a FRAME_SIZE_ERROR connection error. (RFC7540 4.2, RFC7540 6.9)"), {ok, Socket} = do_handshake(Config), %% Send a WINDOW_UPDATE frame with an incorrect size. ok = gen_tcp:send(Socket, << 5:24, 8:8, 0:40, 1000:40 >>), %% Receive a FRAME_SIZE_ERROR connection error. {ok, << _:24, 7:8, _:72, 6:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% Note: There is no particular limits on the size of CONTINUATION frames, %% they can go from 0 to SETTINGS_MAX_FRAME_SIZE. %% Header compression and decompression. headers_compression_error(Config) -> doc("A decoding error in a HEADERS frame's header block must be rejected " "with a COMPRESSION_ERROR connection error. (RFC7540 4.3, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with an invalid header block. ok = gen_tcp:send(Socket, << 10:24, 1:8, 0:5, 1:1, 0:1, 1:1, 0:1, 1:31, 0:10/unit:8 >>), %% Receive a COMPRESSION_ERROR connection error. {ok, << _:24, 7:8, _:72, 9:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. continuation_compression_error(Config) -> doc("A decoding error in a CONTINUATION frame's header block must be rejected " "with a COMPRESSION_ERROR connection error. (RFC7540 4.3, RFC7540 6.10)"), {ok, Socket} = do_handshake(Config), %% Send a CONTINUATION frame with an invalid header block. ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:7, 1:1, 0:1, 1:31 >>, << 10:24, 9:8, 0:5, 1:1, 0:3, 1:31, 0:10/unit:8 >> ]), %% Receive a COMPRESSION_ERROR connection error. {ok, << _:24, 7:8, _:72, 9:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. continuation_with_frame_interleaved_error(Config) -> doc("Frames interleaved in a header block must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 4.3, RFC7540 6.2, RFC7540 6.10)"), {ok, Socket} = do_handshake(Config), %% Send an unterminated HEADERS frame followed by a PING frame. ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:7, 1:1, 0:1, 1:31 >>, cow_http2:ping(0) ]), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. continuation_wrong_stream_error(Config) -> doc("CONTINUATION frames with an incorrect stream identifier must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 4.3, RFC7540 6.2)"), {ok, Socket} = do_handshake(Config), %% Send an unterminated HEADERS frame followed by a CONTINUATION frame for another stream. ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:7, 1:1, 0:1, 1:31 >>, << 0:24, 9:8, 0:9, 3:31 >> ]), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% Stream states. idle_stream_reject_data(Config) -> doc("DATA frames received on an idle stream must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 5.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a DATA frame on an idle stream. ok = gen_tcp:send(Socket, cow_http2:data(1, fin, <<"Unexpected DATA frame.">>)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. idle_stream_accept_headers(Config) -> doc("HEADERS frames received on an idle stream must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame on an idle stream. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a HEADERS frame as a response. {ok, << _:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), ok. idle_stream_accept_priority(Config) -> doc("PRIORITY frames received on an idle stream must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a PRIORITY frame on an idle stream. ok = gen_tcp:send(Socket, cow_http2:priority(1, shared, 3, 123)), %% Receive no error. {error, timeout} = gen_tcp:recv(Socket, 7, 1000), %% Send a HEADERS frame on the same stream. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a HEADERS frame as a response. {ok, << _:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), ok. idle_stream_reject_rst_stream(Config) -> doc("RST_STREAM frames received on an idle stream must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send an RST_STREAM frame on an idle stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, no_error)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. idle_stream_reject_push_promise(Config) -> doc("PUSH_PROMISE frames received on an idle stream must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a PUSH_PROMISE frame on an idle stream. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:push_promise(1, 3, HeadersBlock)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. idle_stream_reject_window_update(Config) -> doc("WINDOW_UPDATE frames received on an idle stream must be rejected " "with a PROTOCOL_ERROR connection error. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a WINDOW_UPDATE frame on an idle stream. ok = gen_tcp:send(Socket, cow_http2:window_update(1, 12345)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %reserved (local) - after sending PUSH_PROMISE: % An endpoint MUST NOT send any type of frame other than HEADERS, % RST_STREAM, or PRIORITY in this state. %%% how to test this? % % A PRIORITY or WINDOW_UPDATE frame MAY be received in this state. % Receiving any type of frame other than RST_STREAM, PRIORITY, or % WINDOW_UPDATE on a stream in this state MUST be treated as a % connection error (Section 5.4.1) of type PROTOCOL_ERROR. %%% we need to use a large enough file for this % %reserved_local_reject_data %reserved_local_reject_headers %reserved_local_accept_priority %reserved_local_accept_rst_stream %reserved_local_reject_push_promise %% do we even care? we reject it always %reserved_local_accept_window_update % %half-closed (remote): % If an endpoint receives additional frames, other than % WINDOW_UPDATE, PRIORITY, or RST_STREAM, for a stream that is in % this state, it MUST respond with a stream error (Section 5.4.2) of % type STREAM_CLOSED. half_closed_remote_reject_data(Config) -> doc("DATA frames received on a half-closed (remote) stream must be rejected " "with a STREAM_CLOSED stream error. (RFC7540 5.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with the FIN flag set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Send a DATA frame on that now half-closed (remote) stream. ok = gen_tcp:send(Socket, cow_http2:data(1, fin, <<"Unexpected DATA frame.">>)), %% Receive a STREAM_CLOSED stream error. {ok, << _:24, 3:8, _:8, 1:32, 5:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. %% We reject all invalid HEADERS with a connection error because %% we do not want to waste resources decoding them. half_closed_remote_reject_headers(Config) -> doc("HEADERS frames received on a half-closed (remote) stream must be rejected " "with a STREAM_CLOSED connection error. (RFC7540 4.3, RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with the FIN flag set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Send a HEADERS frame on that now half-closed (remote) stream. ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. half_closed_remote_accept_priority(Config) -> doc("PRIORITY frames received on a half-closed stream must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with the FIN flag set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Send a PRIORITY frame on that now half-closed (remote) stream. ok = gen_tcp:send(Socket, cow_http2:priority(1, shared, 3, 123)), %% Receive a HEADERS frame as a response. {ok, << _:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), ok. half_closed_remote_accept_rst_stream(Config) -> doc("RST_STREAM frames received on a half-closed stream must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with the FIN flag set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Send an RST_STREAM frame on that now half-closed (remote) stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, no_error)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. %% half_closed_remote_reject_push_promise %% %% We respond to all PUSH_PROMISE frames with a PROTOCOL_ERROR connection error %% because PUSH is disabled in that direction. We therefore cannot test other %% error conditions. half_closed_remote_accept_window_update(Config) -> doc("WINDOW_UPDATE frames received on a half-closed stream must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with the FIN flag set. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Send a WINDOW_UPDATE frame on that now half-closed (remote) stream. ok = gen_tcp:send(Socket, cow_http2:window_update(1, 12345)), %% Receive a HEADERS frame as a response. {ok, << _:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), ok. %% We reject DATA frames sent on closed streams with a STREAM_CLOSED %% connection error regardless of how the stream was closed to simplify %% the implementation. This excludes the few frames we ignore from %% lingering streams that we canceled. rst_stream_closed_reject_data(Config) -> doc("DATA frames received on a stream closed via RST_STREAM must be rejected " "with a STREAM_CLOSED connection error. (RFC7540 5.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Send an RST_STREAM frame to close the stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Send a DATA frame on the now RST_STREAM closed stream. ok = gen_tcp:send(Socket, cow_http2:data(1, fin, <<"Unexpected DATA frame.">>)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% We reject all invalid HEADERS with a connection error because %% we do not want to waste resources decoding them. rst_stream_closed_reject_headers(Config) -> doc("HEADERS frames received on a stream closed via RST_STREAM must be rejected " "with a STREAM_CLOSED connection error. (RFC7540 4.3, RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Send an RST_STREAM frame to close the stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Send a HEADERS frame on the now RST_STREAM closed stream. ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. rst_stream_closed_accept_priority(Config) -> doc("PRIORITY frames received on a stream closed via RST_STREAM " "must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Send an RST_STREAM frame to close the stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Send a PRIORITY frame on that now RST_STREAM closed stream. ok = gen_tcp:send(Socket, cow_http2:priority(1, shared, 3, 123)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. rst_stream_closed_ignore_rst_stream(Config) -> doc("RST_STREAM frames received on a stream closed via RST_STREAM " "must be ignored to avoid looping. (RFC7540 5.1, RFC7540 5.4.2)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Send an RST_STREAM frame to close the stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Send an extra RST_STREAM. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. %% rst_stream_closed_reject_push_promise %% %% We respond to all PUSH_PROMISE frames with a PROTOCOL_ERROR connection error %% because PUSH is disabled in that direction. We therefore cannot test other %% error conditions. rst_stream_closed_reject_window_update(Config) -> doc("WINDOW_UPDATE frames received on a stream closed via RST_STREAM " "must be rejected with a STREAM_CLOSED stream error. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Send an RST_STREAM frame to close the stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Send a WINDOW_UPDATE frame on the now RST_STREAM closed stream. ok = gen_tcp:send(Socket, cow_http2:window_update(1, 12345)), %% Receive a STREAM_CLOSED stream error. {ok, << _:24, 3:8, _:8, 1:32, 5:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. stream_closed_reject_data(Config) -> doc("DATA frames received on a stream closed normally must be rejected " "with a STREAM_CLOSED connection error. (RFC7540 5.1, RFC7540 6.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send a DATA frame on the now closed stream. ok = gen_tcp:send(Socket, cow_http2:data(1, fin, <<"Unexpected DATA frame.">>)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. stream_closed_reject_headers(Config) -> doc("HEADERS frames received on a stream closed normally must be rejected " "with a STREAM_CLOSED connection error. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send a HEADERS frame on the now closed stream. ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. stream_closed_accept_priority(Config) -> doc("PRIORITY frames received on a stream closed normally must be accepted. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send a PRIORITY frame on the now closed stream. ok = gen_tcp:send(Socket, cow_http2:priority(1, shared, 3, 123)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. stream_closed_accept_rst_stream(Config) -> doc("RST_STREAM frames received on a stream closed normally " "must be accepted for a short period. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send an RST_STREAM frame on the now closed stream. ok = gen_tcp:send(Socket, cow_http2:rst_stream(1, cancel)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. %% stream_closed_reject_push_promise %% %% We respond to all PUSH_PROMISE frames with a PROTOCOL_ERROR connection error %% because PUSH is disabled in that direction. We therefore cannot test other %% error conditions. stream_closed_accept_window_update(Config) -> doc("WINDOW_UPDATE frames received on a stream closed normally " "must be accepted for a short period. (RFC7540 5.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send a WINDOW_UPDATE frame on the now closed stream. ok = gen_tcp:send(Socket, cow_http2:window_update(1, 12345)), %% Receive nothing back. {error, timeout} = gen_tcp:recv(Socket, 9, 6000), ok. %% @todo While we accept RST_STREAM and WINDOW_UPDATE for a short period %% after the stream closed normally, we may want to reject the ones coming %% a significant amount of time after that. %% @todo Frames may arrive on a stream after we send an RST_STREAM for it. %% They must be ignored for a short period of time: % % If this state is reached as a result of sending a RST_STREAM % frame, the peer that receives the RST_STREAM might have already % sent -- or enqueued for sending -- frames on the stream that % cannot be withdrawn. An endpoint MUST ignore frames that it % receives on closed streams after it has sent a RST_STREAM frame. % An endpoint MAY choose to limit the period over which it ignores % frames and treat frames that arrive after this time as being in % error. %% @todo Ensure that rejected DATA frames result in the connection %% flow-control window being updated. How to test this? % % Flow-controlled frames (i.e., DATA) received after sending % RST_STREAM are counted toward the connection flow-control window. % Even though these frames might be ignored, because they are sent % before the sender receives the RST_STREAM, the sender will % consider the frames to count against the flow-control window. %% Stream identifiers. reject_streamid_even(Config) -> doc("HEADERS frames received with an even-numbered streamid " "must be rejected with a PROTOCOL_ERROR connection error. (RFC7540 5.1.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with an even-numbered streamid. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(2, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. reject_streamid_0(Config) -> doc("HEADERS frames received with streamid 0 (zero) " "must be rejected with a PROTOCOL_ERROR connection error. (RFC7540 5.1.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with an streamid 0. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(0, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. http_upgrade_reject_reuse_streamid_1(Config) -> doc("Attempts to reuse streamid 1 after upgrading to HTTP/2 " "must be rejected with a PROTOCOL_ERROR connection error. (RFC7540 5.1.1)"), {ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]), ok = gen_tcp:send(Socket, [ "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: Upgrade, HTTP2-Settings\r\n" "Upgrade: h2c\r\n" "HTTP2-Settings: ", base64:encode(cow_http2:settings_payload(#{})), "\r\n", "\r\n"]), ok = do_recv_101(Socket), %% Send a valid preface. ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n", cow_http2:settings(#{})]), %% Receive the server preface. {ok, << Len:24 >>} = gen_tcp:recv(Socket, 3, 1000), {ok, << 4:8, 0:40, _:Len/binary >>} = gen_tcp:recv(Socket, 6 + Len, 1000), %% Send the SETTINGS ack. ok = gen_tcp:send(Socket, cow_http2:settings_ack()), %% Receive the SETTINGS ack, and the response HEADERS and DATA (Stream ID 1). Received = lists:reverse(lists:foldl(fun(_, Acc) -> case gen_tcp:recv(Socket, 9, 1000) of {ok, << 0:24, 4:8, 1:8, 0:32 >>} -> [settings_ack|Acc]; {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [headers|Acc]; {ok, << SkipLen:24, 0:8, _:8, 1:32 >>} -> {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), [data|Acc] end end, [], [1, 2, 3])), case Received of [settings_ack, headers, data] -> ok; [headers, settings_ack, data] -> ok; [headers, data, settings_ack] -> ok end, %% Send a HEADERS frame with streamid 1. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% The RFC gives us various error codes to return for this case, %% depending on whether the stream existed previously and how it %% ended up being (half-)closed. Cowboy rejects all these HEADERS %% frames the same way: with a STREAM_CLOSED connection error. %% Making it a connection error is particularly important in the %% cases where a stream error would be allowed because we avoid %% having to decode the headers and save up resources. reject_streamid_lower(Config) -> doc("HEADERS frames received with streamid lower than the previous stream " "must be rejected with a STREAM_CLOSED connection error. (RFC7540 5.1.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with streamid 5. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(5, fin, HeadersBlock)), %% Receive the response. {ok, << Length1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length1, 6000), {ok, << Length2:24, 0:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000), {ok, _} = gen_tcp:recv(Socket, Length2, 6000), %% Send a HEADERS frame with streamid 3. ok = gen_tcp:send(Socket, cow_http2:headers(3, fin, HeadersBlock)), %% Receive a STREAM_CLOSED connection error. {ok, << _:24, 7:8, _:72, 5:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% @todo We need an option to limit the number of streams one can open %% on a connection. And we need to enforce it. (RFC7540 5.1.1) % % Stream identifiers cannot be reused. Long-lived connections can % result in an endpoint exhausting the available range of stream % identifiers. A server % that is unable to establish a new stream identifier can send a GOAWAY % frame so that the client is forced to open a new connection for new % streams. %% @todo We need this option too. (RFC7540 5.1.2) % A peer can limit the number of concurrently active streams using the % SETTINGS_MAX_CONCURRENT_STREAMS parameter (see Section 6.5.2) within % a SETTINGS frame. The maximum concurrent streams setting is specific % to each endpoint and applies only to the peer that receives the % setting. That is, clients specify the maximum number of concurrent % streams the server can initiate, and servers specify the maximum % number of concurrent streams the client can initiate. % % Streams that are in the "open" state or in either of the "half- % closed" states count toward the maximum number of streams that an % endpoint is permitted to open. Streams in any of these three states % count toward the limit advertised in the % SETTINGS_MAX_CONCURRENT_STREAMS setting. Streams in either of the % "reserved" states do not count toward the stream limit. % % Endpoints MUST NOT exceed the limit set by their peer. An endpoint % that receives a HEADERS frame that causes its advertised concurrent % stream limit to be exceeded MUST treat this as a stream error % (Section 5.4.2) of type PROTOCOL_ERROR or REFUSED_STREAM. The choice % of error code determines whether the endpoint wishes to enable % automatic retry (see Section 8.1.4) for details). % % An endpoint that wishes to reduce the value of % SETTINGS_MAX_CONCURRENT_STREAMS to a value that is below the current % number of open streams can either close streams that exceed the new % value or allow streams to complete. %% (RFC7540 5.2.1) % 3. Flow control is directional with overall control provided by the % receiver. A receiver MAY choose to set any window size that it % desires for each stream and for the entire connection. A sender % MUST respect flow-control limits imposed by a receiver. Clients, % servers, and intermediaries all independently advertise their % flow-control window as a receiver and abide by the flow-control % limits set by their peer when sending. % % 4. The initial value for the flow-control window is 65,535 octets % for both new streams and the overall connection. % % 5. The frame type determines whether flow control applies to a % frame. Of the frames specified in this document, only DATA % frames are subject to flow control; all other frame types do not % consume space in the advertised flow-control window. This % ensures that important control frames are not blocked by flow % control. % % 6. Flow control cannot be disabled. %% (RFC7540 5.2.2) % Even with full awareness of the current bandwidth-delay product, % implementation of flow control can be difficult. When using flow % control, the receiver MUST read from the TCP receive buffer in a % timely fashion. Failure to do so could lead to a deadlock when % critical frames, such as WINDOW_UPDATE, are not read and acted upon. %% @todo Stream priorities. (RFC7540 5.3 5.3.x) %% (RFC7540 5.4.1) % An endpoint that encounters a connection error SHOULD first send a % GOAWAY frame (Section 6.8) with the stream identifier of the last % stream that it successfully received from its peer. The GOAWAY frame % includes an error code that indicates why the connection is % terminating. After sending the GOAWAY frame for an error condition, % the endpoint MUST close the TCP connection. % % An endpoint can end a connection at any time. In particular, an % endpoint MAY choose to treat a stream error as a connection error. % Endpoints SHOULD send a GOAWAY frame when ending a connection, % providing that circumstances permit it. %% (RFC7540 5.4.2) % A RST_STREAM is the last frame that an endpoint can send on a stream. % The peer that sends the RST_STREAM frame MUST be prepared to receive % any frames that were sent or enqueued for sending by the remote peer. % These frames can be ignored, except where they modify connection % state (such as the state maintained for header compression % (Section 4.3) or flow control). % % Normally, an endpoint SHOULD NOT send more than one RST_STREAM frame % for any stream. However, an endpoint MAY send additional RST_STREAM % frames if it receives frames on a closed stream after more than a % round-trip time. This behavior is permitted to deal with misbehaving % implementations. % % To avoid looping, an endpoint MUST NOT send a RST_STREAM in response % to a RST_STREAM frame. %% (RFC7540 5.5) % Extensions are permitted to use new frame types (Section 4.1), new % settings (Section 6.5.2), or new error codes (Section 7). Registries % are established for managing these extension points: frame types % (Section 11.2), settings (Section 11.3), and error codes % (Section 11.4). % % Implementations MUST ignore unknown or unsupported values in all % extensible protocol elements. Implementations MUST discard frames % that have unknown or unsupported types. This means that any of these % extension points can be safely used by extensions without prior % arrangement or negotiation. However, extension frames that appear in % the middle of a header block (Section 4.3) are not permitted; these % MUST be treated as a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. continuation_with_extension_frame_interleaved_error(Config) -> doc("Extension frames interleaved in a header block must be rejected " "with a PROTOCOL_ERROR connection error. " "(RFC7540 4.3, RFC7540 5.5, RFC7540 6.2, RFC7540 6.10)"), {ok, Socket} = do_handshake(Config), %% Send an unterminated HEADERS frame followed by an extension frame. ok = gen_tcp:send(Socket, [ << 0:24, 1:8, 0:7, 1:1, 0:1, 1:31 >>, << 0:24, 128:8, 0:8, 0:32 >> ]), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% (RFC7540 6.1) DATA % Padding: Padding octets that contain no application semantic value. % Padding octets MUST be set to zero when sending. A receiver is % not obligated to verify padding but MAY treat non-zero padding as % a connection error (Section 5.4.1) of type PROTOCOL_ERROR. % % DATA frames MUST be associated with a stream. If a DATA frame is % received whose stream identifier field is 0x0, the recipient MUST % respond with a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 6.2) HEADERS % Padding: Padding octets that contain no application semantic value. % Padding octets MUST be set to zero when sending. A receiver is % not obligated to verify padding but MAY treat non-zero padding as % a connection error (Section 5.4.1) of type PROTOCOL_ERROR. % % A HEADERS frame carries the END_STREAM flag that signals the end % of a stream. However, a HEADERS frame with the END_STREAM flag % set can be followed by CONTINUATION frames on the same stream. % Logically, the CONTINUATION frames are part of the HEADERS frame. % %% @todo We probably need a test for the server sending HEADERS too large. % The payload of a HEADERS frame contains a header block fragment % (Section 4.3). A header block that does not fit within a HEADERS % frame is continued in a CONTINUATION frame (Section 6.10). % % HEADERS frames MUST be associated with a stream. If a HEADERS frame % is received whose stream identifier field is 0x0, the recipient MUST % respond with a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 6.3) PRIORITY % The PRIORITY frame always identifies a stream. If a PRIORITY frame % is received with a stream identifier of 0x0, the recipient MUST % respond with a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 6.4) RST_STREAM % The RST_STREAM frame fully terminates the referenced stream and % causes it to enter the "closed" state. After receiving a RST_STREAM % on a stream, the receiver MUST NOT send additional frames for that % stream, with the exception of PRIORITY. However, after sending the % RST_STREAM, the sending endpoint MUST be prepared to receive and % process additional frames sent on the stream that might have been % sent by the peer prior to the arrival of the RST_STREAM. % % RST_STREAM frames MUST be associated with a stream. If a RST_STREAM % frame is received with a stream identifier of 0x0, the recipient MUST % treat this as a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 6.5) SETTINGS % A SETTINGS frame MUST be sent by both endpoints at the start of a % connection and MAY be sent at any other time by either endpoint over % the lifetime of the connection. Implementations MUST support all of % the parameters defined by this specification. % % SETTINGS frames always apply to a connection, never a single stream. % The stream identifier for a SETTINGS frame MUST be zero (0x0). If an % endpoint receives a SETTINGS frame whose stream identifier field is % anything other than 0x0, the endpoint MUST respond with a connection % error (Section 5.4.1) of type PROTOCOL_ERROR. % % The SETTINGS frame affects connection state. A badly formed or % incomplete SETTINGS frame MUST be treated as a connection error % (Section 5.4.1) of type PROTOCOL_ERROR. %% (RFC7540 6.5.2) % SETTINGS_ENABLE_PUSH (0x2): This setting can be used to disable % server push (Section 8.2). An endpoint MUST NOT send a % PUSH_PROMISE frame if it receives this parameter set to a value of % 0. An endpoint that has both set this parameter to 0 and had it % acknowledged MUST treat the receipt of a PUSH_PROMISE frame as a % connection error (Section 5.4.1) of type PROTOCOL_ERROR. % % SETTINGS_MAX_CONCURRENT_STREAMS (0x3): Indicates the maximum number % of concurrent streams that the sender will allow. This limit is % directional: it applies to the number of streams that the sender % permits the receiver to create. Initially, there is no limit to % this value. It is recommended that this value be no smaller than % 100, so as to not unnecessarily limit parallelism. % % A value of 0 for SETTINGS_MAX_CONCURRENT_STREAMS SHOULD NOT be % treated as special by endpoints. A zero value does prevent the % creation of new streams; however, this can also happen for any % limit that is exhausted with active streams. Servers SHOULD only % set a zero value for short durations; if a server does not wish to % accept requests, closing the connection is more appropriate. % % SETTINGS_INITIAL_WINDOW_SIZE (0x4): % Values above the maximum flow-control window size of 2^31-1 MUST % be treated as a connection error (Section 5.4.1) of type % FLOW_CONTROL_ERROR. % % SETTINGS_MAX_FRAME_SIZE (0x5): % The initial value is 2^14 (16,384) octets. The value advertised % by an endpoint MUST be between this initial value and the maximum % allowed frame size (2^24-1 or 16,777,215 octets), inclusive. % Values outside this range MUST be treated as a connection error % (Section 5.4.1) of type PROTOCOL_ERROR. % % An endpoint that receives a SETTINGS frame with any unknown or % unsupported identifier MUST ignore that setting. (6.5.2 and 6.5.3) %% (RFC7540 6.5.3) % Upon receiving a SETTINGS frame with the ACK flag set, the % sender of the altered parameters can rely on the setting having been % applied. % % If the sender of a SETTINGS frame does not receive an acknowledgement % within a reasonable amount of time, it MAY issue a connection error % (Section 5.4.1) of type SETTINGS_TIMEOUT. %% (RFC7540 6.6) PUSH_PROMISE % @todo PUSH_PROMISE frames have a reserved bit in the payload that must be ignored. % % Padding: Padding octets that contain no application semantic value. % Padding octets MUST be set to zero when sending. A receiver is % not obligated to verify padding but MAY treat non-zero padding as % a connection error (Section 5.4.1) of type PROTOCOL_ERROR. % % PUSH_PROMISE frames MUST only be sent on a peer-initiated stream that % is in either the "open" or "half-closed (remote)" state. The stream % identifier of a PUSH_PROMISE frame indicates the stream it is % associated with. If the stream identifier field specifies the value % 0x0, a recipient MUST respond with a connection error (Section 5.4.1) % of type PROTOCOL_ERROR. % % PUSH_PROMISE MUST NOT be sent if the SETTINGS_ENABLE_PUSH setting of % the peer endpoint is set to 0. An endpoint that has set this setting % and has received acknowledgement MUST treat the receipt of a % PUSH_PROMISE frame as a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. % % Since PUSH_PROMISE reserves a stream, ignoring a PUSH_PROMISE frame % causes the stream state to become indeterminate. A receiver MUST % treat the receipt of a PUSH_PROMISE on a stream that is neither % "open" nor "half-closed (local)" as a connection error % (Section 5.4.1) of type PROTOCOL_ERROR. % % A receiver MUST treat the receipt of a PUSH_PROMISE that promises an % illegal stream identifier (Section 5.1.1) as a connection error % (Section 5.4.1) of type PROTOCOL_ERROR. Note that an illegal stream % identifier is an identifier for a stream that is not currently in the % "idle" state. %% (RFC7540 6.7) PING % PING frames are not associated with any individual stream. If a PING % frame is received with a stream identifier field value other than % 0x0, the recipient MUST respond with a connection error % (Section 5.4.1) of type PROTOCOL_ERROR. %% (RFC7540 6.8) GOAWAY % @todo GOAWAY frames have a reserved bit in the payload that must be ignored. % %% @todo We should eventually implement the mechanism for gracefully %% shutting down of the connection. (Send the GOAWAY, finish processing %% the current set of streams, give up after a certain timeout.) % %% @todo If we graceful shutdown and receive a GOAWAY, we give up too. % A GOAWAY frame might not immediately precede closing of the % connection; a receiver of a GOAWAY that has no more use for the % connection SHOULD still send a GOAWAY frame before terminating the % connection. % %% @todo And it gets more complex when you think about h1 to h2 proxies. % A server that is attempting to gracefully shut down a % connection SHOULD send an initial GOAWAY frame with the last stream % identifier set to 2^31-1 and a NO_ERROR code. This signals to the % client that a shutdown is imminent and that initiating further % requests is prohibited. After allowing time for any in-flight stream % creation (at least one round-trip time), the server can send another % GOAWAY frame with an updated last stream identifier. This ensures % that a connection can be cleanly shut down without losing requests. % %% @todo And of course even if we shutdown we need to be careful about %% the connection state. % After sending a GOAWAY frame, the sender can discard frames for % streams initiated by the receiver with identifiers higher than the % identified last stream. However, any frames that alter connection % state cannot be completely ignored. For instance, HEADERS, % PUSH_PROMISE, and CONTINUATION frames MUST be minimally processed to % ensure the state maintained for header compression is consistent (see % Section 4.3); similarly, DATA frames MUST be counted toward the % connection flow-control window. Failure to process these frames can % cause flow control or header compression state to become % unsynchronized. % % The GOAWAY frame applies to the connection, not a specific stream. % An endpoint MUST treat a GOAWAY frame with a stream identifier other % than 0x0 as a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 6.9) WINDOW_UPDATE % @todo WINDOW_UPDATE frames have a reserved bit in the payload that must be ignored. window_update_reject_0(Config) -> doc("WINDOW_UPDATE frames with an increment of 0 for the connection " "flow control window must be rejected with a " "PROTOCOL_ERROR connection error. (RFC7540 6.9.1)"), {ok, Socket} = do_handshake(Config), %% Send connection-wide WINDOW_UPDATE frame with a value of 0. ok = gen_tcp:send(Socket, [ cow_http2:window_update(0) ]), %% Receive a PROTOCOL_ERROR connection error. {ok, << _:24, 7:8, _:72, 1:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. window_update_reject_0_stream(Config) -> doc("WINDOW_UPDATE frames with an increment of 0 for a stream " "flow control window must be rejected with a " "PROTOCOL_ERROR stream error. (RFC7540 6.9.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame immediately followed by %% a WINDOW_UPDATE frame with a value of 0. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, fin, HeadersBlock), cow_http2:window_update(1, 0) ]), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. % A receiver that receives a flow-controlled frame MUST always account % for its contribution against the connection flow-control window, % unless the receiver treats this as a connection error % (Section 5.4.1). This is necessary even if the frame is in error. % The sender counts the frame toward the flow-control window, but if % the receiver does not, the flow-control window at the sender and % receiver can become different. %% (RFC7540 6.9.1) % The sender MUST NOT % send a flow-controlled frame with a length that exceeds the space % available in either of the flow-control windows advertised by the % receiver. Frames with zero length with the END_STREAM flag set (that % is, an empty DATA frame) MAY be sent if there is no available space % in either flow-control window. window_update_reject_overflow(Config) -> doc("WINDOW_UPDATE frames that cause the connection flow control " "window to exceed 2^31-1 must be rejected with a " "FLOW_CONTROL_ERROR connection error. (RFC7540 6.9.1)"), {ok, Socket} = do_handshake(Config), %% Send a connection-wide WINDOW_UPDATE frame that causes the window to overflow. ok = gen_tcp:send(Socket, [ cow_http2:window_update(16#7fffffff) ]), %% Receive a FLOW_CONTROL_ERROR connection error. {ok, << _:24, 7:8, _:72, 3:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. window_update_reject_overflow_stream(Config) -> doc("WINDOW_UPDATE frames that cause a stream flow control " "window to exceed 2^31-1 must be rejected with a " "FLOW_CONTROL_ERROR stream error. (RFC7540 6.9.1)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame immediately followed by a WINDOW_UPDATE %% frame that causes the stream window to overflow. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, [ cow_http2:headers(1, fin, HeadersBlock), cow_http2:window_update(1, 16#7fffffff) ]), %% Receive a FLOW_CONTROL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 3:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. settings_initial_window_size_changes(Config) -> doc("When the value of SETTINGS_INITIAL_WINDOW_SIZE changes, the server " "must adjust the size of the flow control windows of the active " "streams. (RFC7540 6.9.2)"), {ok, Socket} = do_handshake(Config), %% Set SETTINGS_INITIAL_WINDOW_SIZE to 0 to prevent sending of DATA. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 0})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a response but no DATA frames are coming. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {error, timeout} = gen_tcp:recv(Socket, 9, 1000), %% Set SETTINGS_INITIAL_WINDOW_SIZE to a larger value. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 5})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Receive a DATA frame of that size and no other. {ok, << 5:24, 0:8, 0:8, 1:32, "Hello" >>} = gen_tcp:recv(Socket, 14, 1000), {error, timeout} = gen_tcp:recv(Socket, 9, 1000), %% Set SETTINGS_INITIAL_WINDOW_SIZE to exactly the size in the body. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 12})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Receive the rest of the response. {ok, << 7:24, 0:8, 1:8, 1:32, " world!" >>} = gen_tcp:recv(Socket, 16, 1000), ok. settings_initial_window_size_changes_negative(Config) -> doc("When the value of SETTINGS_INITIAL_WINDOW_SIZE changes, the server " "must adjust the size of the flow control windows of the active " "streams even if their window end up negative. (RFC7540 6.9.2)"), {ok, Socket} = do_handshake(Config), %% Set SETTINGS_INITIAL_WINDOW_SIZE to 5. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 5})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Send a HEADERS frame. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a response with a single DATA frame of the initial size we set. {ok, << SkipLen:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), {ok, _} = gen_tcp:recv(Socket, SkipLen, 1000), {ok, << 5:24, 0:8, 0:8, 1:32, "Hello" >>} = gen_tcp:recv(Socket, 14, 1000), {error, timeout} = gen_tcp:recv(Socket, 9, 1000), %% Set SETTINGS_INITIAL_WINDOW_SIZE to 0 to make the stream's window negative. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 0})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Set SETTINGS_INITIAL_WINDOW_SIZE to exactly the size in the body. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 12})), %% Receive the SETTINGS ack. {ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000), %% Receive the rest of the response. {ok, << 7:24, 0:8, 1:8, 1:32, " world!" >>} = gen_tcp:recv(Socket, 16, 1000), ok. settings_initial_window_size_reject_overflow(Config) -> doc("A SETTINGS_INITIAL_WINDOW_SIZE that causes a flow control window " "to exceed 2^31-1 must be rejected with a FLOW_CONTROL_ERROR " "connection error. (RFC7540 6.9.2)"), {ok, Socket} = do_handshake(Config), %% Set SETTINGS_INITIAL_WINDOW_SIZE to 2^31. ok = gen_tcp:send(Socket, cow_http2:settings(#{initial_window_size => 16#80000000})), %% Receive a FLOW_CONTROL_ERROR connection error. {ok, << _:24, 7:8, _:72, 3:32 >>} = gen_tcp:recv(Socket, 17, 6000), ok. %% (RFC7540 6.9.3) %% @todo The right way to do this seems to be to wait for the SETTINGS ack %% before we KNOW the flow control window was updated on the other side. % A receiver that wishes to use a smaller flow-control window than the % current size can send a new SETTINGS frame. However, the receiver % MUST be prepared to receive data that exceeds this window size, since % the sender might send data that exceeds the lower limit prior to % processing the SETTINGS frame. %% (RFC7540 6.10) CONTINUATION % CONTINUATION frames MUST be associated with a stream. If a % CONTINUATION frame is received whose stream identifier field is 0x0, % the recipient MUST respond with a connection error (Section 5.4.1) of % type PROTOCOL_ERROR. % % A CONTINUATION frame MUST be preceded by a HEADERS, PUSH_PROMISE or % CONTINUATION frame without the END_HEADERS flag set. A recipient % that observes violation of this rule MUST respond with a connection % error (Section 5.4.1) of type PROTOCOL_ERROR. %% (RFC7540 7) Error Codes % Unknown or unsupported error codes MUST NOT trigger any special % behavior. These MAY be treated by an implementation as being % equivalent to INTERNAL_ERROR. %% (RFC7540 8.1) % A HEADERS frame (and associated CONTINUATION frames) can only appear % at the start or end of a stream. An endpoint that receives a HEADERS % frame without the END_STREAM flag set after receiving a final (non- % informational) status code MUST treat the corresponding request or % response as malformed (Section 8.1.2.6). % %% @todo This one is interesting to implement because Cowboy DOES this. % A server can % send a complete response prior to the client sending an entire % request if the response does not depend on any portion of the request % that has not been sent and received. When this is true, a server MAY % request that the client abort transmission of a request without error % by sending a RST_STREAM with an error code of NO_ERROR after sending % a complete response (i.e., a frame with the END_STREAM flag). headers_reject_uppercase_header_name(Config) -> doc("Requests containing uppercase header names must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a uppercase header name. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"HELLO">>, <<"world">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_response_pseudo_headers(Config) -> doc("Requests containing response pseudo-headers must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.1, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a response pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<":status">>, <<"200">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_unknown_pseudo_headers(Config) -> doc("Requests containing unknown pseudo-headers must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.1, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with an unknown pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<":upgrade">>, <<"websocket">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. %% @todo Implement request trailers. reject_pseudo_headers_in_trailers(Config) -> % Pseudo-header fields MUST NOT appear in trailers. % Endpoints MUST treat a request or response that contains % undefined or invalid pseudo-header fields as malformed % (Section 8.1.2.6). reject_pseudo_headers_after_regular_headers(Config) -> doc("Requests containing pseudo-headers after regular headers must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.1, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a pseudo-header after regular headers. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<"content-length">>, <<"0">>}, {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_connection_header(Config) -> doc("Requests containing a connection header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a connection header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"connection">>, <<"close">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_keep_alive_header(Config) -> doc("Requests containing a keep-alive header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a keep-alive header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"keep-alive">>, <<"timeout=5, max=1000">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_proxy_authenticate_header(Config) -> doc("Requests containing a connection header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a proxy-authenticate header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"proxy-authenticate">>, <<"Basic">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_proxy_authorization_header(Config) -> doc("Requests containing a connection header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a proxy-authorization header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"proxy-authorization">>, <<"Basic YWxhZGRpbjpvcGVuc2VzYW1l">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_transfer_encoding_header(Config) -> doc("Requests containing a connection header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a transfer-encoding header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"transfer-encoding">>, <<"chunked">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_upgrade_header(Config) -> doc("Requests containing a connection header must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a upgrade header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"upgrade">>, <<"websocket">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. accept_te_header_value_trailers(Config) -> doc("Requests containing a TE header with a value of \"trailers\" " "must be accepted. (RFC7540 8.1.2.2)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a TE header with value "trailers". {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"te">>, <<"trailers">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a response. {ok, << _:24, 1:8, _:8, 1:32 >>} = gen_tcp:recv(Socket, 9, 1000), ok. reject_te_header_other_values(Config) -> doc("Requests containing a TE header with a value other than \"trailers\" must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a TE header with a different value. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>}, {<<"te">>, <<"trailers, deflate;q=0.5">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. %% (RFC7540 8.1.2.2) % This means that an intermediary transforming an HTTP/1.x message to % HTTP/2 will need to remove any header fields nominated by the % Connection header field, along with the Connection header field % itself. Such intermediaries SHOULD also remove other connection- % specific header fields, such as Keep-Alive, Proxy-Connection, % Transfer-Encoding, and Upgrade, even if they are not nominated by the % Connection header field. reject_userinfo(Config) -> doc("An authority containing a userinfo component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with a userinfo authority component. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"user@localhost">>}, %% @todo Correct port number. {<<":path">>, <<"/">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. %% (RFC7540 8.1.2.3) % To ensure that the HTTP/1.1 request line can be reproduced % accurately, this pseudo-header field MUST be omitted when % translating from an HTTP/1.1 request that has a request target in % origin or asterisk form (see [RFC7230], Section 5.3). Clients % that generate HTTP/2 requests directly SHOULD use the ":authority" % pseudo-header field instead of the Host header field. An % intermediary that converts an HTTP/2 request to HTTP/1.1 MUST % create a Host header field if one is not present in a request by % copying the value of the ":authority" pseudo-header field. reject_empty_path(Config) -> doc("A request containing an empty path component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with an empty path component. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_missing_pseudo_header_method(Config) -> doc("A request without a method component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame without a :method pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_many_pseudo_header_method(Config) -> doc("A request containing more than one method component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with more than one :method pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_missing_pseudo_header_scheme(Config) -> doc("A request without a scheme component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame without a :scheme pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_many_pseudo_header_scheme(Config) -> doc("A request containing more than one scheme component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with more than one :scheme pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_missing_pseudo_header_authority(Config) -> doc("A request without an authority component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame without an :authority pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_many_pseudo_header_authority(Config) -> doc("A request containing more than one authority component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with more than one :authority pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_missing_pseudo_header_path(Config) -> doc("A request without a path component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame without a :path pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>} %% @todo Correct port number. ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. reject_many_pseudo_header_path(Config) -> doc("A request containing more than one path component must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7540 8.1.2.3, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with more than one :path pseudo-header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>}, {<<":path">>, <<>>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. %% (RFC7540 8.1.2.4) % For HTTP/2 responses, a single ":status" pseudo-header field is % defined that carries the HTTP status code field (see [RFC7231], % Section 6). This pseudo-header field MUST be included in all % responses; otherwise, the response is malformed (Section 8.1.2.6). %% (RFC7540 8.1.2.5) % To allow for better compression efficiency, the Cookie header field % MAY be split into separate header fields, each with one or more % cookie-pairs. If there are multiple Cookie header fields after % decompression, these MUST be concatenated into a single octet string % using the two-octet delimiter of 0x3B, 0x20 (the ASCII string "; ") % before being passed into a non-HTTP/2 context, such as an HTTP/1.1 % connection, or a generic HTTP server application. %% (RFC7540 8.1.2.6) % A request or response that includes a payload body can include a % content-length header field. A request or response is also malformed % if the value of a content-length header field does not equal the sum % of the DATA frame payload lengths that form the body. A response % that is defined to have no payload, as described in [RFC7230], % Section 3.3.2, can have a non-zero content-length header field, even % though no content is included in DATA frames. reject_duplicate_content_length_header(Config) -> doc("A request with duplicate content-length headers must be rejected " "with a PROTOCOL_ERROR stream error. (RFC7230 3.3.2, RFC7540 8.1.2.6)"), {ok, Socket} = do_handshake(Config), %% Send a HEADERS frame with more than one content-length header. {HeadersBlock, _} = cow_hpack:encode([ {<<":method">>, <<"GET">>}, {<<":scheme">>, <<"http">>}, {<<":authority">>, <<"localhost">>}, %% @todo Correct port number. {<<":path">>, <<>>}, {<<"content-length">>, <<"12">>}, {<<"content-length">>, <<"12">>} ]), ok = gen_tcp:send(Socket, cow_http2:headers(1, nofin, HeadersBlock)), %% Receive a PROTOCOL_ERROR stream error. {ok, << _:24, 3:8, _:8, 1:32, 1:32 >>} = gen_tcp:recv(Socket, 13, 6000), ok. % Intermediaries that process HTTP requests or responses (i.e., any % intermediary not acting as a tunnel) MUST NOT forward a malformed % request or response. Malformed requests or responses that are % detected MUST be treated as a stream error (Section 5.4.2) of type % PROTOCOL_ERROR. % % For malformed requests, a server MAY send an HTTP response prior to % closing or resetting the stream. Clients MUST NOT accept a malformed % response. Note that these requirements are intended to protect % against several types of common attacks against HTTP; they are % deliberately strict because being permissive can expose % implementations to these vulnerabilities. %% @todo It migh be worth reproducing the good examples. (RFC7540 8.1.3) %% (RFC7540 8.1.4) % A server MUST NOT indicate that a stream has not been processed % unless it can guarantee that fact. If frames that are on a stream % are passed to the application layer for any stream, then % REFUSED_STREAM MUST NOT be used for that stream, and a GOAWAY frame % MUST include a stream identifier that is greater than or equal to the % given stream identifier. %% (RFC7540 8.2) % Promised requests MUST be cacheable (see [RFC7231], Section 4.2.3), % MUST be safe (see [RFC7231], Section 4.2.1), and MUST NOT include a % request body. % % The server MUST include a value in the ":authority" pseudo-header % field for which the server is authoritative (see Section 10.1). % % A client cannot push. Thus, servers MUST treat the receipt of a % PUSH_PROMISE frame as a connection error (Section 5.4.1) of type % PROTOCOL_ERROR. %% (RFC7540 8.2.1) % The header fields in PUSH_PROMISE and any subsequent CONTINUATION % frames MUST be a valid and complete set of request header fields % (Section 8.1.2.3). The server MUST include a method in the ":method" % pseudo-header field that is safe and cacheable. If a client receives % a PUSH_PROMISE that does not include a complete and valid set of % header fields or the ":method" pseudo-header field identifies a % method that is not safe, it MUST respond with a stream error % (Section 5.4.2) of type PROTOCOL_ERROR. % %% @todo This probably should be documented. % The server SHOULD send PUSH_PROMISE (Section 6.6) frames prior to % sending any frames that reference the promised responses. This % avoids a race where clients issue requests prior to receiving any % PUSH_PROMISE frames. % % PUSH_PROMISE frames MUST NOT be sent by the client. % % PUSH_PROMISE frames can be sent by the server in response to any % client-initiated stream, but the stream MUST be in either the "open" % or "half-closed (remote)" state with respect to the server. % PUSH_PROMISE frames are interspersed with the frames that comprise a % response, though they cannot be interspersed with HEADERS and % CONTINUATION frames that comprise a single header block. %% (RFC7540 8.2.2) % If the client determines, for any reason, that it does not wish to % receive the pushed response from the server or if the server takes % too long to begin sending the promised response, the client can send % a RST_STREAM frame, using either the CANCEL or REFUSED_STREAM code % and referencing the pushed stream's identifier. % % A client can use the SETTINGS_MAX_CONCURRENT_STREAMS setting to limit % the number of responses that can be concurrently pushed by a server. % Advertising a SETTINGS_MAX_CONCURRENT_STREAMS value of zero disables % server push by preventing the server from creating the necessary % streams. This does not prohibit a server from sending PUSH_PROMISE % frames; clients need to reset any promised streams that are not % wanted. %% @todo Implement CONNECT. (RFC7540 8.3) status_code_421(Config) -> doc("The 421 Misdirected Request status code can be sent. (RFC7540 9.1.2)"), ConnPid = gun_open(Config), Ref = gun:get(ConnPid, "/resp/reply2/421"), {response, fin, 421, _} = gun:await(ConnPid, Ref), ok. %% @todo Review (RFC7540 9.2, 9.2.1, 9.2.2) TLS 1.2 usage. %% We probably want different ways to enforce these to simplify the life %% of users. A function cowboy:start_h2_tls could do the same as start_tls %% but with the security requirements of HTTP/2 enforced. Another way is to %% have an option at the establishment of the connection that checks that %% the security of the connection is adequate. %% (RFC7540 10.3) % The HTTP/2 header field encoding allows the expression of names that % are not valid field names in the Internet Message Syntax used by % HTTP/1.1. Requests or responses containing invalid header field % names MUST be treated as malformed (Section 8.1.2.6). % % Similarly, HTTP/2 allows header field values that are not valid. % While most of the values that can be encoded will not alter header % field parsing, carriage return (CR, ASCII 0xd), line feed (LF, ASCII % 0xa), and the zero character (NUL, ASCII 0x0) might be exploited by % an attacker if they are translated verbatim. Any request or response % that contains a character not permitted in a header field value MUST % be treated as malformed (Section 8.1.2.6). Valid characters are % defined by the "field-content" ABNF rule in Section 3.2 of [RFC7230]. %% (RFC7540 10.5) Denial-of-Service Considerations % An endpoint that doesn't monitor this behavior exposes itself to a % risk of denial-of-service attack. Implementations SHOULD track the % use of these features and set limits on their use. An endpoint MAY % treat activity that is suspicious as a connection error % (Section 5.4.1) of type ENHANCE_YOUR_CALM. %% (RFC7540 10.5.1) % A server that receives a larger header block than it is willing to % handle can send an HTTP 431 (Request Header Fields Too Large) status % code [RFC6585]. A client can discard responses that it cannot % process. The header block MUST be processed to ensure a consistent % connection state, unless the connection is closed. %% @todo Implement CONNECT and limit the number of CONNECT streams (RFC7540 10.5.2). %% @todo This probably should be documented. (RFC7540 10.6) % Implementations communicating on a secure channel MUST NOT compress % content that includes both confidential and attacker-controlled data % unless separate compression dictionaries are used for each source of % data. Compression MUST NOT be used if the source of data cannot be % reliably determined. Generic stream compression, such as that % provided by TLS, MUST NOT be used with HTTP/2 (see Section 9.2). %% (RFC7540 A) % An HTTP/2 implementation MAY treat the negotiation of any of the % following cipher suites with TLS 1.2 as a connection error % (Section 5.4.1) of type INADEQUATE_SECURITY.