Its not a GWT limitation, its a browser restriction - Same Origin Policy.

There are ways to workaround the limitation. In your case, you can setup a
proxy server to forward the requests from one domain to another. Apache
mod_proxy can help you with this.

For example, suppose you have http://rpc.example.com/MyRpcService and
http://UI.AnotherExample.com/. You can setup Apache to forward requests from
http://UI.AnotherExample.com/services/* to rpc.example.com. Then, you'd
configure your RPC client to send requests to "../services/MyRpcService".
Since the browser is sending the request to the same domain, everything
works fine.

It works well (we have our production systems working that way), but I don't
recommend using it unless you have run out of options.

--Sri


On 1 June 2010 11:35, Umesh Adtani <adt...@gmail.com> wrote:

> I have a RPC servlet that I would like to make available to other GWT
> application developers.  The problem that I currently see is that
> GWT.create(<ServiceInterfaceClass>) requires the service to be
> deployed on the same host where the GWT application is deployed.
> There is no way to do something like
> GWT.create(<ServiceInterfaceClass>,<URL-where-service-is-deployed>) to
> create the handle to the service.
>
> From client's perspective, this means that if your GWT application
> talks to multiple RPC services hosted on various different hosts, then
> there is no way to talk to those services even if you have shared and
> client code-base (containing interfaces, asyncs etc) available to you
> in some form of jar files.  Is there a way to get this working in
> current GWT versions?
>
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