What is OOB Callback Server
Callback Server is your personal private Callback Server to help you scan for Blind Cross-Site Scripting (XSS) vulnerabilities.
Setting up your OOB Callback Server
To make use of your OOB Callback Server, you’d need to set up your OOB Server first.
Go to /oob-server/oob-server to setup your personal Server.
This process only takes a few seconds to complete
Once the setup of your Callback Server is finished, you can use your subdomain to test for blind cross-site scripting vulnerabilities: