Provide original exception in WebSocketHandler#handleException

[makcon]

It is impossible to recognize top level exception in case of an internal error after -
https://github.com/AsyncHttpClient/async-http-client/blob/master/client/src/main/java/org/asynchttpclient/netty/handler/WebSocketHandler.java#L145

[slandelle]

What's you're problem exactly? Could you provide a reproducer demonstrating your use case, please?

[makcon]

Recently we tried to send big content using web sockets. And we got null param in WebSocketListener.onError(Throwable t) After deep debugging we found we exceeded default maxFramePayloadLength ("Max frame length of " + this.maxFramePayloadLength + " has been exceeded.") We spent couple of hours to realized it. If you would provide original exception instead of e.getCause() we see the message in log.

[slandelle]

Makes sense. Thanks!