| 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 | DENY | 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 | sandbox allow-forms allow-same-origin; default-src 'none'; connect-src 'self'; img-src 'self'; style-src 'self'; base-uri 'self'; form-action 'self' https://auth.ack.tax/; manifest-src 'self'; require-trusted-types-for 'script'; upgrade-insecure-requests; frame-ancestors 'none'; | Good | Control resources the user agent is allowed to load for a given page.
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| Referrer-Policy | no-referrer | 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 | none | 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=(); ambient-light-sensor=(); autoplay=(); battery=(); camera=(); cross-origin-isolated=(); display-capture=(); document-domain=(); encrypted-media=(); execution-while-not-rendered=(); execution-while-out-of-viewport=(); fullscreen=*; geolocation=(); gyroscope=(); keyboard-map=(); magnetometer=(); microphone=(); midi=(); navigation-override=(); payment=(); picture-in-picture=(); publickey-credentials-get=(); screen-wake-lock=(); sync-xhr=(); usb=(); web-share=*; xr-spatial-tracking=(); clipboard-read=(); clipboard-write=(self); gamepad=(); speaker-selection=(); conversion-measurement=(); focus-without-user-activation=(); hid=*; idle-detection=(); interest-cohort=(); serial=(); sync-script=(); trust-token-redemption=(); window-placement=(); vertical-scroll=* | New | Allow and deny the use of browser features in a document or iframe.
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| Cross-Origin-Embedder-Policy | require-corp | New | Configure embedding cross-origin resources into the document.
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| Cross-Origin-Opener-Policy | same-origin | 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 | same-site | New | Request that the browser blocks no-cors cross-origin/cross-site requests to the given resource.
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| X-XSS-Protection | 0 | 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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