Hello, Debian 9 ISPConfig Version: 3.1.14p2 single Nginx Two reputable tools indicate the following errors to improve on each website. I read many tutorials on Nginx. I did not find anything with ISPconfig. No tutorial tried does a correct work. How to proceed ? 1. Allow compression of the following resources (Gzip) to reduce the amount of data transferred. CSS and JS. Text resources must be compressed (Gzip, Deflate, or Brotli) to reduce the total number of bytes in the network. 2. The following compressible resources, which can be cached, must be associated with a "Vary: Accept-Encoding" header: CSS and JS. 3. To prevent or mitigate the potential damage of an XSS attack, you must configure your server so that the response from the master resource contains the HTTP header "Content-Security-Policy". 4. Use an HTTP header "X-Frame-Options". Configure your server so that the response from the master resource contains the HTTP header "X-Frame-Options". 5. Configure an HTTP header "X-XSS-Protection". 6. Configure an HTTP header "X-Content-Type-Options". CSS, JSS, WOFF2. 7. Only 6% of the site is http/2 compatible.