It works on the desktop, when you press the "test service" button, but if you launch the in browser "test" button, the service does a post. I I have a sandbox text application http://project.tiggzi.com/mobile-fram... the service url is http://69.169.142.26:8080/mmserver/j_...
I have a rest service that requires POST. In the builder I specify a post, but the exported application calls GET, so it doesn't work, since the rest service is expecting a POST