Set HTTP header in one request with Javascript - Learn how

  1. Introduction
  2. Method
  3. Conclusion


If you're working with web development, you may find yourself needing to set HTTP headers in your requests. In this article, we'll learn how to set HTTP headers in a single request using Javascript.


First, let's define the problem we're trying to solve. HTTP headers are used to provide additional information to web servers and clients. They can be used to provide authentication, cache control, and content type information. In order to set HTTP headers in a single request, we need to use the XMLHttpRequest object in Javascript.

The XMLHttpRequest object is used to make asynchronous requests to a server. It provides a way to send and receive data from a server without reloading the page. To set HTTP headers using XMLHttpRequest, we first need to create an instance of the object:

    var xhr = new XMLHttpRequest();

Next, we need to use the setRequestHeader method to set the HTTP headers we need:

    xhr.setRequestHeader('Content-Type', 'application/json');
    xhr.setRequestHeader('Authorization', 'Bearer [TOKEN]');

In this example, we're setting two HTTP headers. The first, 'Content-Type', sets the content type of the request to JSON. The second, 'Authorization', sets the authentication token using a bearer token.

Finally, we need to send the request:



Setting HTTP headers in a single request using Javascript is a simple process. By using the XMLHttpRequest object, we can set the headers we need using the setRequestHeader method and send the request using the send method. This provides a way to customize our requests and provide additional information to web servers and clients.

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