Handshake failure with basic Authorization

[Na2l]

adding header basic auth header to the websocket object causes server to close the connection imidietly with this warning messageL

Session 30 closed because of CloseReason: code [1002], reason [A fragmented control frame was received but control frames may not be fragmented]

String identity = userID + ":" + passwd;
String encoded= Base64.encodeToString(identity.getBytes(), Base64.DEFAULT);
webSocket.addHeader("Authorization", "Basic " + encoded);

The workaround is to instead of adding the basic auth header to add the user:pass to the request uri, i.e.:
uri = new URI("wss://" + user+":" + pass+ <SERVER_IP>:"443/websocket" );