X-Powered-By header exposes your technology stack

Your server is sending an X-Powered-By response header that reveals which technology framework is running your website to anyone who inspects your HTTP headers. Attackers use this information to narrow their targeting — if they know your exact platform and version, they can look up known vulnerabilities specific to it and focus their probing. Removing this header does not fix vulnerabilities, but it removes one piece of information that makes targeted attacks easier. Configure your server or hosting environment to remove the X-Powered-By header from all responses. Most platforms have a one-line setting to suppress it.