Finding it difficult to grasp the concept of enabling CORS through an ajax request

I'm struggling to figure out how to enable CORS while using Ajax to send data to a remote server on a different domain. Despite researching extensively and reading numerous Stackoverflow threads, I can't seem to make sense of it all. I understand that in order to bypass the browser's security restrictions, I need to include an Access-Control-Allow-Origin: * header in my code, but where exactly should this go? I've come across suggestions to add this header as a simple tag in a PHP file and then utilize curls to create a POST request, but my expertise lies more in JavaScript than PHP. Can anyone provide guidance on how to approach this issue? It's worth noting that I don't have the ability to configure or modify the server settings, so any solutions must be implemented on the client side.

Here is the snippet of code I currently have. While I was able to successfully send this message using a Chrome plugin, I understand that this workaround is not ideal.

$.ajax({
       type: "POST",
       url: "someURL",
       data: {name: "John", lastName : "Johnson", state : "NYC" },
       headers: {
       "Access-Control-Allow-Origin: *"
       }
       })
       .done(function( msg ) {
       console.log(msg);
});

Answer №1

There's no need for you to perform this task. The browser is intelligent enough to determine which headers are required. In fact, that's the whole purpose: the browser has identified the cross-site scripting problem and is seeking approval from the server before proceeding.

You might have to adjust your backend code to handle the headers correctly.

Answer №2

Access-Control-Allow-Origin is an important response header that must be included by the server you are requesting data from in order to grant permission for your JavaScript code to access it.

If I am unable to adjust the settings on the server, all necessary changes must be made on the client side.

It is not possible for your JavaScript code to independently grant itself permission to access data from external sites.

To fetch the required data, implementing a proxy server will be necessary.

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