Spring Security 3.0 authentication problem

[julio]

Hi,

I have a GWT client that communicates with a Spring/SpringSecurity 3.0
server via REST/JSON.
Both run on the same tomcat/jetty perfectly, but I have a problem
introducing the authentication:
If I "POST" the server with an external HTTP client the url:

http://localhost:8080/myserverapp/j_spring_security_check?j_username=julio&j_password=mypass

the server response is OK (200)

but when GWT client tries the same, the status code returned is 0.
This is the code I'm using at the moment:

final StringBuilder content = new StringBuilder();
        content.append("j_username=" + URL.encode("julio"));
        content.append("&j_password=" + URL.encode("mypass"));

        final RequestBuilder builder = new
RequestBuilder(RequestBuilder.POST, URL.encode(BASEURL + "/
j_spring_security_check"));
        builder.setHeader("Content-Type", "application/x-www-form-
urlencoded");

        try {
            builder.sendRequest(content.toString(), new
RequestCallback() {

                                public void onResponseReceived(Request request, 
Response response)
{
                                        Window.alert("STATUS : " + 
response.getStatusCode()); // returns
0 ??
                                }

                                public void onError(Request request, Throwable 
exception) {
                                        Window.alert("ERROR");
                                }

            });
        } catch (final RequestException e) {
            Window.alert(e.getLocalizedMessage());
        }

why does it return 0? any idea?

Thanks,
Julio

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