RestMan is a browser extension to work on HTTP requests. It allows you to manage requests made to a web server. It works with any website that provides an API (Application Programming Interface).

How to use it?

You need to install it on your browser. 

Once you have installed it, you can start using it by clicking on the RestMan icon. Then, enter the URL and choose what method to use. Options include GET, POST, PUT, DELETE, and PATCH.

The end result shows you the information on the response (time, size, type). You will also see the content response in the response section.