Update Cowlib to 2.0.1 and fix OTP 20.1+ Websocket compression

Unfortunately compression will be disabled for 20.1, 20.1.1
and 20.1.2. In additiona I do not recommend 20.1.3 due to
issues inflating some specific sizes.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/cowboy_websocket.erl b/src/cowboy_websocket.erl
index 3ec9f9a..d38c673 100644
--- a/src/cowboy_websocket.erl
+++ b/src/cowboy_websocket.erl
@@ -144,23 +144,27 @@ websocket_extensions(State=#state{extensions=Extensions}, Req=#{pid := Pid},
 		[{<<"permessage-deflate">>, Params}|Tail], RespHeader) ->
 	%% @todo Make deflate options configurable.
 	Opts = #{level => best_compression, mem_level => 8, strategy => default},
-	case cow_ws:negotiate_permessage_deflate(Params, Extensions, Opts#{owner => Pid}) of
+	try cow_ws:negotiate_permessage_deflate(Params, Extensions, Opts#{owner => Pid}) of
 		{ok, RespExt, Extensions2} ->
 			websocket_extensions(State#state{extensions=Extensions2},
 				Req, Tail, [<<", ">>, RespExt|RespHeader]);
 		ignore ->
 			websocket_extensions(State, Req, Tail, RespHeader)
+	catch exit:{error, incompatible_zlib_version, _} ->
+		websocket_extensions(State, Req, Tail, RespHeader)
 	end;
 websocket_extensions(State=#state{extensions=Extensions}, Req=#{pid := Pid},
 		[{<<"x-webkit-deflate-frame">>, Params}|Tail], RespHeader) ->
 	%% @todo Make deflate options configurable.
 	Opts = #{level => best_compression, mem_level => 8, strategy => default},
-	case cow_ws:negotiate_x_webkit_deflate_frame(Params, Extensions, Opts#{owner => Pid}) of
+	try cow_ws:negotiate_x_webkit_deflate_frame(Params, Extensions, Opts#{owner => Pid}) of
 		{ok, RespExt, Extensions2} ->
 			websocket_extensions(State#state{extensions=Extensions2},
 				Req, Tail, [<<", ">>, RespExt|RespHeader]);
 		ignore ->
 			websocket_extensions(State, Req, Tail, RespHeader)
+	catch exit:{error, incompatible_zlib_version, _} ->
+		websocket_extensions(State, Req, Tail, RespHeader)
 	end;
 websocket_extensions(State, Req, [_|Tail], RespHeader) ->
 	websocket_extensions(State, Req, Tail, RespHeader).