| Strict-Transport-Security | max-age=15552000; includeSubDomains; preload | Good | Declare that a website is only accessible over a secure connection (HTTPS).
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| X-Frame-Options | — | 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 | — | Good | Control resources the user agent is allowed to load for a given page.
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| Referrer-Policy | no-referrer-when-downgrade | 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 | accelerometer=(self); ambient-light-sensor=(self); autoplay=(self); battery=(self); camera=(self); cross-origin-isolated=(self); display-capture=(self); document-domain=(self); encrypted-media=(self); execution-while-not-rendered=(self); execution-while-out-of-viewport=(self); fullscreen=(self); geolocation=(self); gyroscope=(self); keyboard-map=(self); magnetometer=(self); microphone=(self); midi=(self); navigation-override=(self); payment=(self); picture-in-picture=(self); publickey-credentials-get=(self); screen-wake-lock=(self); sync-xhr=(self); usb=(self); web-share=(self); xr-spatial-tracking=(self); clipboard-read=(self); clipboard-write=(self); gamepad=(self); speaker-selection=(self); conversion-measurement=(self); focus-without-user-activation=(self); hid=(self); idle-detection=(self); interest-cohort=(self); serial=(self); sync-script=(self); trust-token-redemption=(self); unload=(self); window-placement=(self); vertical-scroll=(self) | 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 | — | 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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