Allow passing the Req and an updated Opts when upgrading protocols

test/ws_upgrade_with_opts_handler.erl

@@ -0,0 +1,28 @@
+%% Feel free to use, reuse and abuse the code in this file.
+
+-module(ws_upgrade_with_opts_handler).
+-behaviour(cowboy_websocket_handler).
+
+-export([init/3]).
+-export([websocket_init/3]).
+-export([websocket_handle/3]).
+-export([websocket_info/3]).
+-export([websocket_terminate/3]).
+
+init(_Any, Req, _Opts) ->
+	{upgrade, protocol, cowboy_websocket, Req, <<"success">>}.
+
+websocket_init(_TransportName, Req, Response) ->
+	Req2 = cowboy_req:compact(Req),
+	erlang:send_after(10, self(), send_response),
+	{ok, Req2, Response}.
+
+websocket_handle(_Frame, Req, State) ->
+	{ok, Req, State}.
+
+websocket_info(send_response, Req, State = Response)
+		when is_binary(Response) ->
+	{reply, {text, Response}, Req, State}.
+
+websocket_terminate(_Reason, _Req, _State) ->
+	ok.