GWT RPC response header

Question

Is there any way to read the header information received by GWT client, on the RPC response?

Response header
Server                 Apache-Coyote/1.1
Set-Cookie             JSESSIONID=3379B1E57BEB2FE227EDC1F57BF550ED; Path=/GWT
Content-Encoding       gzip
Content-Disposition    attachment
Content-Type           application/json;charset=utf-8
Content-Length         209
Date                   Fri, 05 Nov 2010 13:07:31 GMT

I'm particularly interest in identifying when client receives the Set-Cookie attribute on its header.

Is there any way to do that on GWT?

I found that on

com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter<T>

exist the method

public void onResponseReceived(Request request, Response response) { ... }

On the parameter Response seems to have the information I need. The this is, exist some way to get that without "racking" the GWT compiler code?

thanks

JuDaC

Answer 1

You may try to override the RpcRequestBuilder.doSetCallback method and force your service to use it:

MyServiceAsync service = GWT.create(MyService.clas);
((ServiceDefTarget) service).setRpcRequestBuilder(new RpcRequestBuilder() {
    @Override
    protected void doSetCallback(RequestBuilder rb, final RequestCallback callback) {
        super.doSetCallback(rb, new RequestCallback() {

            @Override
            public void onResponseReceived(Request request, Response response) {
                String headerValue = response.getHeader("my-header");
                // do sth...
                callback.onResponseReceived(request, response);
            }

            @Override
            public void onError(Request request, Throwable exception) {
                callback.onError(request, exception);
            }
        });
    }
});

Inspired by http://stuffthathappens.com/blog/2009/12/22/custom-http-headers-with-gwt-rpc/

Answer 2

If you declare your async service method to return a RequestBuilder you should be able to set a RequestCallback that will be notified when the Response is received. I haven't tried this myself, but it looks like what you need.