How to modify the request then forward to server?

[wuxudong]

@chhsiao90 , NitmProxyListener can intercept the request and return a response instead of sending it to server by using Optional<FullHttpResponse> onHttp1Request(ConnectionContext connectionContext, FullHttpRequest request),

but how can I modify the request then forward to server? For example, add a signature header to original request.

Thanks for your great work.