Error creating WebSocket connection using AsyncHttpClient behind Squid Proxy

Question

Library in use: AsyncHtpClient Library: Version : 1.9.32 Location: https://github.com/AsyncHttpClient/async-http-client

Netty Version : 3.10.3.Final

Proxy: Squid Proxy

I am trying to create a websocket connection using AsyncHttpClinet library. It works fine when using without the proxy. But when I start a proxy and pass in the Host, port, username and password , I am unable to create a websocket connection.

It get a stack trace which says Invalid Status Code 400:

Caused by: java.lang.IllegalStateException: Invalid Status Code 400
    at com.ning.http.client.ws.WebSocketUpgradeHandler.onCompleted(WebSocketUpgradeHandler.java:76)
    at com.ning.http.client.ws.WebSocketUpgradeHandler.onCompleted(WebSocketUpgradeHandler.java:29)
    at com.ning.http.client.providers.netty.future.NettyResponseFuture.getContent(NettyResponseFuture.java:177)
    at com.ning.http.client.providers.netty.future.NettyResponseFuture.done(NettyResponseFuture.java:214)
    ... 35 more

I am setting the proxy object like this:

ProxyServer ps = new ProxyServer("host-name",portNo,"user_name","password");

AsyncHttpClientConfig cf = new AsyncHttpClientConfig.Builder().setProxyServer(ps).build();
WebSocket websocket = c.prepareGet(url) 
                .execute(new WebSocketUpgradeHandler.Builder().addWebSocketListener( 
                        new WebSocketTextListener() { 
                            @Override 
                            public void onMessage(String message) { 

                            } 

                            @Override 
                            public void onFragment(String s, boolean b) { 
                            } 

                            @Override 
                            public void onOpen(WebSocket websocket) { 
                            } 

                            @Override 
                            public void onClose(WebSocket websocket) { 
                            } 

                            @Override 
                            public void onError(Throwable t) { 
                            } 
                        } 

                ).build() 
                ).get(); 

Are there any other steps to configure a proxy for websocket connections?

I have also tried configuring the ProxyServer object like this:

ProxyServer ps = new ProxyServer(ProxyServer.Protocol.HTTPS,"host-name",portNo,"user_name","password");