Hi Looking a bit into the code, GWT supports basic authentication using setUser(String user) and setPassword(String password) in com.google.gwt.http.client.RequestBuilder.
org.restlet.gwt.Client uses RequestBuilder.doSend(String requestData, RequestCallback callback) via GwtHttpClientCall, HttpClientConverter and HttpClientHelper. In com.google.gwt.http.client.XMLHTTPRequest (called from RequestBuilder.doSend(...)) it looks like GWT utilizes the browsers xmlHttpRequest implementation to instantiate a request using username and password. During debug I have set a breakpoint in RequestBuilder.doSend(..) and set the user and password "manually". It works against resources secured by basic authentication. Would it be possible to use this GWT feature to implement support for basic authentication? Best Regerds, Rasmus

