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-rw-r--r--src/gun_http2.erl9
1 files changed, 7 insertions, 2 deletions
diff --git a/src/gun_http2.erl b/src/gun_http2.erl
index 3587466..64850fa 100644
--- a/src/gun_http2.erl
+++ b/src/gun_http2.erl
@@ -163,8 +163,13 @@ parse(Data, State0=#http2_state{status=preface, http2_machine=HTTP2Machine},
%% Any error in the preface is converted to this specific error
%% to make debugging the problem easier (it's the server's fault).
_ ->
- {connection_error(State0, {connection_error, protocol_error,
- 'Invalid connection preface received. (RFC7540 3.5)'}), EvHandlerState0}
+ Reason = case Data of
+ <<"HTTP/1",_/bits>> ->
+ 'Invalid connection preface received. Appears to be an HTTP/1 response? (RFC7540 3.5)';
+ _ ->
+ 'Invalid connection preface received. (RFC7540 3.5)'
+ end,
+ {connection_error(State0, {connection_error, protocol_error, Reason}), EvHandlerState0}
end;
parse(Data, State0=#http2_state{status=Status, http2_machine=HTTP2Machine, streams=Streams},
EvHandler, EvHandlerState0) ->