How to Add Custom HTTP Headers to Ajax Requests in JavaScript and jQuery?

Exploring Custom HTTP Headers in JavaScript and jQuery Requests

Question:

How can you create or add custom HTTP headers to Ajax requests using JavaScript or jQuery?

Answer:

JavaScript and jQuery offer a range of options to add custom headers to Ajax requests. Here are various approaches:

• Individual Request Headers: To add headers to a specific request, use the headers property:

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

• Default Headers for All Requests: To set default headers for every request, use $.ajaxSetup():

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

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

• beforeSend Hook for Custom Headers: This method allows you to add headers before each request:

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

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

Additional Considerations:

• With ajaxSetup(), you can define only one set of default headers.
• beforeSend can be used to set multiple headers and have custom logic before sending the request.

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