Error creating WebSocket connection using AsyncHttpClient behind Squid Proxy - 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");