Fix a bug preventing 'onresponse' from being called on errors

src/cowboy_http_protocol.erl

@@ -438,12 +438,13 @@ ensure_response(#http_req{socket=Socket, transport=Transport,
 
 %% Only send an error reply if there is no resp_sent message.
 -spec error_terminate(cowboy_http:status(), #state{}) -> ok.
-error_terminate(Code, State=#state{socket=Socket, transport=Transport}) ->
+error_terminate(Code, State=#state{socket=Socket, transport=Transport,
+		onresponse=OnResponse}) ->
 	receive
 		{cowboy_http_req, resp_sent} -> ok
 	after 0 ->
 		_ = cowboy_http_req:reply(Code, #http_req{
-			socket=Socket, transport=Transport,
+			socket=Socket, transport=Transport, onresponse=OnResponse,
 			connection=close, pid=self(), resp_state=waiting}),
 		ok
 	end,

test/http_SUITE.erl

@@ -45,6 +45,7 @@
 -export([nc_zero/1]).
 -export([onrequest/1]).
 -export([onrequest_reply/1]).
+-export([onresponse_crash/1]).
 -export([onresponse_reply/1]).
 -export([pipeline/1]).
 -export([rest_keepalive/1]).
@@ -116,6 +117,7 @@ groups() ->
 			onrequest_reply
 		]},
 		{onresponse, [], [
+			onresponse_crash,
 			onresponse_reply
 		]}
 	].
@@ -604,6 +606,13 @@ onrequest_hook(Req) ->
 			Req3
 	end.
 
+onresponse_crash(Config) ->
+	Client = ?config(client, Config),
+	{ok, Client2} = cowboy_client:request(<<"GET">>,
+		build_url("/handler_errors?case=init_before_reply", Config), Client),
+	{ok, 777, Headers, Client3} = cowboy_client:response(Client2),
+	{<<"x-hook">>, <<"onresponse">>} = lists:keyfind(<<"x-hook">>, 1, Headers).
+
 onresponse_reply(Config) ->
 	Client = ?config(client, Config),
 	{ok, Client2} = cowboy_client:request(<<"GET">>,