Extra Headers are not taking JSON payloads

[Djurrez]

        public void Initialize()
        {
            var client = new SocketIOClient.SocketIO("http://mywebsocket", new SocketIOOptions
            {
                ExtraHeaders = new Dictionary<string, string>
                {
                    {"Authorization", "{\"id\":123, \"first_name\":\"A\", \"last_name\":\"A\", \"username\":\"A\", \"auth_date\":123, \"hash\":\"gjsdkgbskjdgbkasjdbgjkasbdjgkasdgbjkasbdkagjk\"}"},
                    {"SessionID", "test" }
                }
            });

            client.ConnectAsync().Wait();

        }

Seems like ExtraHeaders are not taking any stringified JSON data. Once you do this it stops sending out any requests.

[doghappy]

the reason is that the header "Authorization" is a special header. when you try to add it, .NET will try to validate value first. Sure the value you provided is invalid.

the issue same as #300

so how to solve it?

1. try to use another header name
2. allow "authorization" header.

   socket.io-client-csharp/src/SocketIOClient/Transport/Http/DefaultHttpClient.cs

   Lines 21 to 24 in 956d919

   	private static readonly HashSet<string> allowedHeaders = new HashSet<string>
   	{
   	"user-agent",
   	};

for option2, actually I have implemented but I need to do some research.