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Differences: 1, AJAX requests the server through the xmlHttpRequest object, while the http request requests the server through the httpRequest object; 2, the AJAX request header will have an extra "x-requested-with" parameter with a value of "XMLHttpRequest".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

The difference between AJAX request and ordinary HTTP request

AJAX implements refresh interaction by requesting the server to accept the request return data through the xmlHttpRequest object.

An ordinary http request requests the server to accept the request to return data through the httpRequest object, which requires page refresh

The AJAX request header will have an extra x-requested-with parameter with a value of XMLHttpRequest

AJAX request

Normal http request

The AJAX request header will have an extra x-requested-with parameter with a value of XMLHttpRequest

String requestType = request.getHeader ("X-Requested-With")

Take this as the basis for judgment.

Expand knowledge:

What is Ajax:

Ajax (Asynchronous Javascrpt And Xml) is a technology used in browsers, which allows the browser to obtain a small amount of information from the server instead of refreshing the entire page by using an asynchronous communication mechanism between the browser and the server. Ajax is not a new technology, or it is not a technology, it is just a synthesis of a variety of technologies: Javascript, Html, Css, Dom, Xml, XMLHttpRequest and other technologies play their respective roles in cooperation in a certain way to form Ajax.

XMLHttpRequest is a core of Ajax technology, and Ajax can't operate without it.

XMLHttpRequest:XMLHttpRequest is an object of XMLHttp component, and XMLHttpRequest can be used to realize asynchronous communication between browser and server. Through the HttpRequest object, the Web application can submit information to the server without refreshing the page, and then get the return information from the server.

Let's talk about Ajax and websocket, http.

In fact, these three have their own advantages and disadvantages. The emergence of websocket and ajax solves some problems of http protocol, but http still has advantages in many places. Ajax is one-way (client-server), http is also one-way initiated by client, websocket implements two-way, but they each have their own suitable use scenarios.

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