Postback

In web development, a postback is the exchange of information between servers to report a user's action on a website, network, or app.

Technically speaking, a postback is an HTTP POST to the same page that the form is on.

Postbacks are most commonly discussed in relation to JSF and ASP or ASP.NET.

This problem was addressed in ASP.NET with the __doPostBack() function and an application model that allows a page to perform validation and processing on its own form data.

Various utility methods are present in the JSF API to programmatically check if a given request is a postback or not.