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Moving forward with my mobile app development learning process, I've found a new obstacle: Cross-origin Request Sharing or CORS.

I am using a combination of AngularJS + jQuery Mobile (Cordova phone client) and ASP.NET Web API (backend). My issue is that I have not bee able to complete a POST request (or any other type of request) to an API controller.

My AngularJS controller uses the $http.post() service method to call the Web API controller. However, Chrome debugger says that the call failed in an OPTIONS request (possibly the CORS preflight request).

I have implemented the CORS action selector from the following post: Enabling CORS in Web API Project. Even tough I can call the api method from Fiddler, AngularJS keeps failing on the OPTIONS preflight request.

Is there anything I should be aware of about AngularJS and cross-domain calls? Any possible solution to my predicament?

Thanks.

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another angularjs question re: OPTIONS –  johlrich Sep 22 '12 at 13:37
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Check out Thinktecture Cors objects, with those (nugettable) you can get full CORS support in WebApi without any code of your own.

Even with a correct CORS implementation I've had a really strange issue with IIS 7 that was solved by enabling all verbs for WebDav (yes, WebDav - don't ask me why I just followed instructions on a blog post :-D).

Do this:

  • Open IIS manager, go to your application's Handler Mapping.
  • Double click the WebDav handler
  • Click "Request Restriction"
  • On the "Verbs" tab, select "All verbs".

Again, no idea why WebApi uses WebDav, but this solved problems with POST and DELETE that wouldn't work in spite of a correct CORS implementation.

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