CORS error with jquery

Question

I'm currently working on a project using the cloudapp API and I'm using jquery. Here is my code:

 $.ajax({
            headers: { "Accept": "application/json"},
            type: 'GET',
            url: 'http://cl.ly/2wr4',
            crossDomain: true,
            success: function(data, textStatus, request){
                console.log(data);
            }
 });

When I run this I get 200 OK response and this error in Firefox:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://cl.ly/2wr4. This can be fixed by moving the resource to the same domain or enabling CORS.

and this error in Google Chrome:

XMLHttpRequest cannot load http://cl.ly/2wr4. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.

and nothing is logged to the console. Please how can I fix this error?

Thanks.

Answer 1

An important note for those newer coders is that everything on http://enable-cors.org/server.html assumes you have a server running. If you're new, like I was originally, these type of answers don't help.

If you've just made some code on your computer, CodePen, etc - you can't configure this.

There's an important difference between server-side and client-side scripting - your jquery is running on the client side (that is, the users computer / browser) and as such there's no such thing as setting the headers there.

I finally started making progress with this issue when I set up my own server and my own PHP files (PHP is server-side, as such its processed on the server - not the browser) and was able to start making requests just fine.

Adding this for anyone who is being drowned in answers involving the "Header set Access-Control-Allow-Origin "*" answer. It really frustrated me when I started as well.