What is Ajax cache?

For all jQuery AJAX requests, default option is cache = true for all datatype except datatype = ‘script’ or ‘jsonp’. Different browser have different default policy on caching ajax requests. Step 2: If a user update and saves students data, then make an AJAX request to update existing student’s data.

What Ajax means?

Asynchronous JavaScript And XML
AJAX stands for Asynchronous JavaScript And XML. In a nutshell, it is the use of the XMLHttpRequest object to communicate with servers.

How do I stop Ajax from caching?

You need to make your request using the $. ajax() method so you can actually set the cache option to false . However, all this does is what you call a “quick fix hack”. It adds _={current_timestamp} to the query string so that the request will not be cached.

What is an Ajax request and why is it used?

AJAX uses both a browser built-in XMLHttpRequest object to get data from the web server and JavaScript and HTML DOM to display that content to the user. AJAX is also a good solution for handling failures because you can program custom error messages to send if, for example, a user’s account or cart information.

What’s the difference between Ajax and HTTP caching?

It simply obeys the normal HTTP caching rules based on the response headers returned from the server. If you know about HTTP caching already, you can apply that knowledge to Ajax caching. The only real difference is that you may need to setup response headers in a different way to static files.

Is there a way to prevent Ajax from being cached?

As @Athasach said, according to the jQuery docs, $.ajaxSetup ( {cache:false}) will not work for other than GET and HEAD requests. You are better off sending back a Cache-Control: no-cache header from your server anyway.

What does the Expires header do in Ajax?

The Expires header allows the browser to reuse the cached content for a period of time and avoid any unnecessary round-trips to the server. Last-Modified: It’s a good idea to set this so that the browser can use an If-Modified-Since header in a conditional GET request to check its locally cached content.

How does the browser know about Ajax requests?

The HTTP and Cache sub-systems of modern browsers are at a much lower level than Ajax’s XMLHttpRequest object. At this level, the browser doesn’t know or care about Ajax requests. It simply obeys the normal HTTP caching rules based on the response headers returned from the server.