| Strict-Transport-Security | max-age=31536000; includeSubDomains; preload | Good | Declare that a website is only accessible over a secure connection (HTTPS).
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| X-Frame-Options | SAMEORIGIN | Good | Indicate whether a browser should be allowed to render a page in a <frame>, <iframe>, <embed> or <object>.
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| X-Content-Type-Options | nosniff | Good | Indicate that the MIME types advertised in the Content-Type headers should be followed and not be changed.
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| Content-Security-Policy | upgrade-insecure-requests | Good | Control resources the user agent is allowed to load for a given page.
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| Referrer-Policy | strict-origin-when-cross-origin | Good | Control how much referrer information should be included with requests.
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| Clear-Site-Data | — | Good | Control the data stored by a client browser for their origins.
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| 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.
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| Permissions-Policy | autoplay=(); camera=(); cross-origin-isolated=(); display-capture=(); document-domain=(); encrypted-media=(); fullscreen=(); geolocation=(); gyroscope=(); keyboard-map=(); magnetometer=(); microphone=(); midi=(); payment=(); picture-in-picture=(); publickey-credentials-get=(); screen-wake-lock=(); sync-xhr=(self); usb=(); web-share=(); xr-spatial-tracking=() | New | Allow and deny the use of browser features in a document or iframe.
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| Cross-Origin-Embedder-Policy | — | New | Configure embedding cross-origin resources into the document.
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| Cross-Origin-Opener-Policy | — | New | Ensure a top-level document does not share a browsing context group with cross-origin documents.
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| Cross-Origin-Resource-Policy | — | New | Request that the browser blocks no-cors cross-origin/cross-site requests to the given resource.
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| X-XSS-Protection | 1; mode=block | Deprecated | Deprecated. Stops pages from loading when they detect reflected cross-site scripting (XSS) attacks.
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| Feature-Policy | autoplay 'none'; camera 'none'; cross-origin-isolated 'none'; display-capture 'none'; document-domain 'none'; encrypted-media 'none'; fullscreen 'none'; geolocation 'none'; gyroscope 'none'; keyboard-map 'none'; magnetometer 'none'; microphone 'none'; midi 'none'; payment 'none'; picture-in-picture 'none'; publickey-credentials-get 'none'; screen-wake-lock 'none'; sync-xhr 'none'; usb 'none'; web-share 'none'; xr-spatial-tracking 'none' | Deprecated | Deprecated. Replaced by the Permissions-Policy header.
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| Expect-CT | — | Deprecated | Deprecated. Opt in to reporting and/or enforcement of Certificate Transparency requirements.
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| Public-Key-Pins | — | Deprecated | Deprecated. Allows HTTPS websites to resist impersonation by attackers using mis-issued or otherwise fraudulent certificates.
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