Add support in websocket sub-protocols

kasmweb/core/rfb.js

@@ -57,6 +57,7 @@ export default class RFB extends EventTargetMixin {
         this._shared = 'shared' in options ? !!options.shared : true;
         this._repeaterID = options.repeaterID || '';
         this._showDotCursor = options.showDotCursor || false;
+        this._wsProtocols = options.wsProtocols || ['binary'];
 
         // Internal state
         this._rfb_connection_state = '';
@@ -472,7 +473,7 @@ export default class RFB extends EventTargetMixin {
 
         try {
             // WebSocket.onopen transitions to the RFB init states
-            this._sock.open(this._url, ['binary']);
+            this._sock.open(this._url, this._wsProtocols);
             this.sentEventsCounter+=1;
         } catch (e) {
             if (e.name === 'SyntaxError') {

kasmweb/docs/API.md

@@ -187,6 +187,9 @@ connection to a specified VNC server.
       - A `DOMString` specifying the ID to provide to any VNC repeater
         encountered.
 
+    `wsProtocols`
+      - Protocols to use in the WebSocket connection, the default is: ['binary']
+
 #### connect
 
 The `connect` event is fired after all the handshaking with the server