Unseen by the user, the header (HTTP-Header Protokoll) of a website is exchanged between the Client and the Server for every query and response. The Header influences the behavior of the browser on the user side. Largely, these are handled independently of the queried Webapplikation and are defined in the webserver configurations. The Header_Scanner now allows you to examine the HTTP header of your web application for insecure configurations. The scanner (Crawler) checks the information of the HTTP-header of your website and generates a report on any vulnerabilities found that could enable an attacker to execute attacks via faked sender IP addresses (Spoofing).