Strict-Transport-Security max-age =31536000; includeSubDomains ; preload Good Declare that a website is only accessible over a secure connection (HTTPS). X-Frame-Options DENY Good Indicate whether a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>. X-Content-Type-Options nosniff Good Indicate that the MIME types advertised in the Content-Type headers should be followed and not be changed. Content-Security-Policy default-src 'none'; script-src 'self'; object-src 'none'; base-uri 'none'; img-src 'self' data:; font-src 'self'; frame-src https://www.youtube.com/; media-src 'self'; connect-src 'self'; manifest-src 'none'; prefetch-src 'none'; worker-src 'self'; form-action 'self'; frame-ancestors 'none'; block-all-mixed-content ; style-src 'self'Good Control resources the user agent is allowed to load for a given page. Referrer-Policy same-origin Good Control how much referrer information should be included with requests. Clear-Site-Data — Good Control the data stored by a client browser for their origins. X-Permitted-Cross-Domain-Policies — Good Control whether a web client such as Adobe Flash Player or Adobe Acrobat has permission to handle data across domains. Permissions-Policy geolocation =(); vibrate =(); accelerometer =(); ambient-light-sensor =(); autoplay =(); battery =(); camera =(); display-capture =(); document-domain =(); execution-while-not-rendered =(); execution-while-out-of-viewport =(); encrypted-media =(); fullscreen =(self); gyroscope =(); magnetometer =(); microphone =(); midi =(); payment =(); picture-in-picture =(); usb =(); wake-lock =(); web-share =(); xr-spatial-tracking =(); vr =(); interest-cohort =()New Allow and deny the use of browser features in a document or iframe. Cross-Origin-Embedder-Policy — New Configure embedding cross-origin resources into the document. Cross-Origin-Opener-Policy — New Ensure a top-level document does not share a browsing context group with cross-origin documents. Cross-Origin-Resource-Policy — New Request that the browser blocks no-cors cross-origin/cross-site requests to the given resource. X-XSS-Protection — Deprecated Deprecated. Stops pages from loading when they detect reflected cross-site scripting (XSS) attacks. Feature-Policy — Deprecated Deprecated. Replaced by the Permissions-Policy header. Expect-CT — Deprecated Deprecated. Opt in to reporting and/or enforcement of Certificate Transparency requirements. Public-Key-Pins — Deprecated Deprecated. Allows HTTPS websites to resist impersonation by attackers using mis-issued or otherwise fraudulent certificates.