how to enable headers in ispconfig? Missing Headers Content-Security-Policy Content Security Policy is an effective measure to protect your site from XSS attacks. By whitelisting sources of approved content, you can prevent the browser from loading malicious assets. X-Frame-Options X-Frame-Options tells the browser whether you want to allow your site to be framed or not. By preventing a browser from framing your site you can defend against attacks like clickjacking. Recommended value "x-frame-options: SAMEORIGIN". X-XSS-Protection X-XSS-Protection sets the configuration for the cross-site scripting filter built into most browsers. Recommended value "X-XSS-Protection: 1; mode=block". X-Content-Type-Options X-Content-Type-Options stops a browser from trying to MIME-sniff the content type and forces it to stick with the declared content-type. The only valid value for this header is "X-Content-Type-Options: nosniff". Referrer-Policy Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites.
Simply run a2enmod headers and then service apache restart, if it is not yet enabled. Then add what you want from the above into the apache directives or in custom conf to apply them in all sites automatically. You have to resync for all sites for the later to work.
