Access remote service using GWTP Rest Dispatch

[Arpit Tripathi]

I want to separate packages for UI and backend development of my GWTP app. 

Currently my UI access the backend using Rest dispatch configured like this: 

bindConstant().annotatedWith(RestApplicationPath.class).to("/MyProject/api");

I want to access remote service using localhost UI (running GWT app using eclipse plugin). I changed the above line to:

bindConstant().annotatedWith(RestApplicationPath.class).to("http://my-app.appspot.com/MyProject/api");

Using this, call successfully reaches server ( I can see this in appengine logs) but UI  always gets back status code 0.

What is wrong with above setup? Do I have to do something else to access remote service using GWT ui ?

Thanks.

[Arpit Tripathi]

SO link: http://stackoverflow.com/questions/27694641/access-remote-service-using-gwtp-rest-dispatch

[Richard Wallis]

To make a request from a different domain you need to set CORS headers:

https://en.wikipedia.org/wiki/Cross-origin_resource_sharing

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[Arpit Tripathi]

Thanks Richard.

I added CORS filter in my Jersey app using following CORS filter:

 headers.add("Access-Control-Allow-Origin", "*");
 headers.add("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
 headers.add("Access-Control-Allow-Headers", "X-Requested-With,content-type,x-gwt-module-base");

Using this, I can login to remote server, and I can see that remote data is fetched (profile photo of user is updated and remote credentials are accepted). However, any other operation is still considered un-authorized on server. So this is not a GWTP issue anymore but what can I do to make it work?

Thanks again for helping out.

[Arpit Tripathi]

To clarify further, OPTIONS request (pre-flight) gets back 'unauthorized' message while actual request gets back status code 0.

[Richard Wallis]

I haven't yet switched over to REST-dispatch in my own projects so I don't know how to set it up.   Hopefully someone else can help you out.