Allow request headers to be included in initial connection to server

transport/websocket.go

@@ -88,11 +88,13 @@ type WebsocketTransport struct {
 	SendTimeout    time.Duration
 
 	BufferSize int
+
+	RequestHeader http.Header
 }
 
 func (wst *WebsocketTransport) Connect(url string) (conn Connection, err error) {
 	dialer := websocket.Dialer{}
-	socket, _, err := dialer.Dial(url, nil)
+	socket, _, err := dialer.Dial(url, wst.RequestHeader)
 	if err != nil {
 		return nil, err
 	}