XMLHttpRequest cannot load http://localhost:8080/api/test. Origin http://localhost:3000 is not allowed by Access-Control-Allow-Origin. 

I read about cross domain ajax requests, and understand the underlying security issue. In my case, 2 servers are running locally, and like to enable cross domain requests during testing.

localhost:8080 - Google Appengine dev server
localhost:3000 - Node.js server

I am issuing an ajax request to localhost:8080 - GAE server while my page is loaded from node server. What is the easiest, and safest ( Don’t want to start chrome with disable-web-security option). If I have to change 'Content-Type', should I do it at node server? How?

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