Add a workaround to disable chunked transfer-encoding

This is an undocumented workaround to disable chunks when using HTTP/1.1.
It can be used when the client advertises itself as HTTP/1.1 despite not
understanding the chunked transfer-encoding.

Usage can be found looking at the test for it. When activated, Cowboy
will still advertise itself as HTTP/1.1, but will send the body the same
way it would if it was HTTP/1.0.

test/http_SUITE.erl

@@ -90,6 +90,7 @@
 -export([stream_body_set_resp_close/1]).
 -export([stream_body_set_resp_chunked/1]).
 -export([stream_body_set_resp_chunked10/1]).
+-export([streamed_response/1]).
 -export([te_chunked/1]).
 -export([te_chunked_chopped/1]).
 -export([te_chunked_delayed/1]).
@@ -167,6 +168,7 @@ groups() ->
 		stream_body_set_resp_close,
 		stream_body_set_resp_chunked,
 		stream_body_set_resp_chunked10,
+		streamed_response,
 		te_chunked,
 		te_chunked_chopped,
 		te_chunked_delayed,
@@ -352,6 +354,7 @@ init_dispatch(Config) ->
 	cowboy_router:compile([
 		{"localhost", [
 			{"/chunked_response", http_chunked, []},
+			{"/streamed_response", http_streamed, []},
 			{"/init_shutdown", http_init_shutdown, []},
 			{"/long_polling", http_long_polling, []},
 			{"/headers/dupe", http_handler,
@@ -1285,6 +1288,17 @@ stream_body_set_resp_chunked10(Config) ->
 	end,
 	{error, closed} = Transport:recv(Socket, 0, 1000).
 
+streamed_response(Config) ->
+	Client = ?config(client, Config),
+	{ok, Client2} = cowboy_client:request(<<"GET">>,
+		build_url("/streamed_response", Config), Client),
+	{ok, 200, Headers, Client3} = cowboy_client:response(Client2),
+	false = lists:keymember(<<"transfer-encoding">>, 1, Headers),
+	{ok, Transport, Socket} = cowboy_client:transport(Client3),
+	{ok, <<"streamed_handler\r\nworks fine!">>}
+		= Transport:recv(Socket, 29, 1000),
+	{error, closed} = cowboy_client:response(Client3).
+
 te_chunked(Config) ->
 	Client = ?config(client, Config),
 	Body = list_to_binary(io_lib:format("~p", [lists:seq(1, 100)])),

test/http_SUITE_data/http_streamed.erl

@@ -0,0 +1,20 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+-module(http_streamed).
+-behaviour(cowboy_http_handler).
+-export([init/3, handle/2, terminate/3]).
+
+init({_Transport, http}, Req, _Opts) ->
+	{ok, Req, undefined}.
+
+handle(Req, State) ->
+	Req2 = cowboy_req:set([{resp_state, waiting_stream}], Req),
+	{ok, Req3} = cowboy_req:chunked_reply(200, Req2),
+	timer:sleep(100),
+	cowboy_req:chunk("streamed_handler\r\n", Req3),
+	timer:sleep(100),
+	cowboy_req:chunk("works fine!", Req3),
+	{ok, Req3, State}.
+
+terminate(_, _, _) ->
+	ok.