How to know a HTTP request is from Ajax?

Question

Is it possible to know that a HTTP request is from Ajax?If yes, how?

Answer 1

Many frameworks add a header X-Requested-With set to XMLHttpRequest when sending an AJAX request. If you are using jQuery or Microsoft frameworks, this should work. If using another framework, you'll have to check the documentation. Since normal requests don't have the header, a check for the presence of the header should be sufficient.

If you are using your own "home-built" AJAX or the framework doesn't do this, but does allow you to set a header, you could simply follow this convention and add your own header when making the request.