use string for json protocol

diff --git a/lib/router/transports/web_socket.ex b/lib/router/transports/web_socket.ex
index 9a242338e8cf43f8f3adb9a9f5d63a08b409e4e1..3f3aa0c3a66904fa960b5788222d382f24048c48 100644 (file)
--- a/lib/router/transports/web_socket.ex
+++ b/lib/router/transports/web_socket.ex
@@ -10,7 +10,7 @@ defmodule Wampex.Router.Transports.WebSocket do
   alias Wampex.Serializers.{JSON, MessagePack}
 
   @protocol_header "sec-websocket-protocol"
-  @json 'wamp.2.json'
+  @json "wamp.2.json"
   @msgpack "wamp.2.msgpack"
 
   defstruct [:serializer, :session]