How Can I Customize HTTP Headers in JavaScript or jQuery for Ajax Requests?

Customizing HTTP Headers with JavaScript or jQuery

In the realm of Ajax development, the ability to add or manipulate custom HTTP headers is often essential for integrating with remote services or enhancing data transfer. To address this need, JavaScript and jQuery provide versatile solutions that empower developers to tailor headers according to specific requirements.

Individual Request Customization

When you desire to add a custom header to a specific Ajax request, utilize the headers property within the $.ajax() function. By specifying key-value pairs, you can define the desired headers.

$.ajax({
    url: 'foo/bar',
    headers: { 'x-my-custom-header': 'some value' }
});

Default Header Configuration

To establish default headers applied to all subsequent Ajax requests, employ the $.ajaxSetup() method. This allows for a global definition of headers that will be automatically appended to every request.

$.ajaxSetup({
    headers: { 'x-my-custom-header': 'some value' }
});

// Sends your custom header
$.ajax({ url: 'foo/bar' });

Note that any headers defined within an individual request will override the default headers.

Pre-Request Hook with beforeSend

Alternatively, you can leverage the beforeSend hook within $.ajaxSetup() to dynamically modify headers before each request. This hook provides more flexibility and control over header manipulations.

$.ajaxSetup({
    beforeSend: function(xhr) {
        xhr.setRequestHeader('x-my-custom-header', 'some value');
    }
});

// Sends your custom header
$.ajax({ url: 'foo/bar' });

Remember that multiple calls to ajaxSetup() will only apply the last set of default headers and execute the last beforeSend callback.

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