(Critical) Comparing AJAX GET Requests and HTTP GET Requests: identifying the true client

When a typical GET request is made through the browser, it can be said that the browser acts as the client. However, who exactly serves as the client in the case of a GET request via AJAX? Although it still occurs within the browser, I am intrigued to delve deeper into this distinction.

Is it plausible to consider the JavaScript engine of the browser as the client for an AJAX GET request, while viewing the entire browser as the client for a standard GET request? This argument holds weight especially if the JavaScript engine operates in a separate process.

Can anyone provide further insight into this matter?

According to Wikipedia, on AJAX:

XMLHttpRequest (XHR) is an API represented as an object with methods that facilitate data transmission between a web browser and server. This object is made available by the browser's JavaScript environment.

javascriptajaxhttpclient-server

Answer №1

Let's consider a larger context: The communication between browsers and web servers follows the Client-Server model. In this model, the server views the client as an IP address paired with an IP port that has initiated an HTTP request.

The response to the HTTP request is sent back to the same IP address and IP port from which the request originated, where it is then handled by the initiating process.

This process represents your browser, which will receive and internally process the response.

Browsers can initiate client requests for various protocols, including HTTP, HTTPS, FTP, FILE, and more.

XMLHttpRequest serves as an API supported by modern browsers that...

...enables clients to exchange data with servers, supporting various protocols beyond just HTTP (such as FILE and FTP).

For further information on XMLHttpRequest, visit this link.

In my opinion, the browser acts as the client for all types of requests (HTTP GET, HTTP POST...) regardless of whether they are triggered through Ajax/XMLHttpRequest or direct URL access. How the browser internally manages these requests is not directly tied to the concept of the Client-Server model.

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