No 'Access-Control-Allow-Origin' header is present on the requested resource error

Question

I'm trying to fetch the feed of a news website. Thought I'd use google's feed API to convert the feedburner feed into json. The following url will return 10 posts from the feed, in json format. http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=10&q=http://feeds.feedburner.com/mathrubhumi

I used the following code to get the contents of above url

$.ajax({   type: "GET",   dataType: "jsonp",   url: "http://ajax.googleapis.com/ajax/services/feed/load",   data: {     "v": "1.0",     "num": "10",     "q": "http://feeds.feedburner.com/mathrubhumi"   },   success: function(result) {     //.....   } }); 

but it's not working and I'm getting the following error

XMLHttpRequest cannot load http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&num=10&q=http%3A%2F%2Ffeeds.feedburner.com%2Fmathrubhumi. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access.

How do I fix this?

Answer 1

If you use Google Chrome browser you can hack with an extension.

You can find a Chrome extension that will modify CORS headers on the fly in your application. Obviously, this is Chrome only, but I like that it works with zero changes anywhere at all.

You can use it for debugging your app on a local machine (if everything works in production).

Notice: If URL becomes broken the extension name is Access-Control-Allow-Origin: *. I recommend you to disable this extension when you not working on your stuff, because, for example, youtube does not work with this extension.

Answer 2

I believe this might likely be that Chrome does not support localhost to go through the Access-Control-Allow-Origin -- see Chrome issue

To have Chrome send Access-Control-Allow-Origin in the header, just alias your localhost in your /etc/hosts file to some other domain, like:

127.0.0.1   localhost yourdomain.com 

Then if you'd access your script using yourdomain.com instead of localhost, the call should succeed.