| 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 | default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://www.google.com https://www.gstatic.com https://code.jquery.com https://cdnjs.cloudflare.com; script-src-elem 'self' 'unsafe-inline' 'unsafe-eval' https://www.google.com/recaptcha/ https://www.gstatic.com https://code.jquery.com https://cdnjs.cloudflare.com; style-src 'self' 'unsafe-inline' https://cdnjs.cloudflare.com https://cdn.jsdelivr.net https://fonts.googleapis.com; style-src-elem 'self' 'unsafe-inline' https://fonts.googleapis.com https://cdn.jsdelivr.net https://cdnjs.cloudflare.com; font-src 'self' data: https://fonts.gstatic.com; img-src 'self' data: https://www.google.com https://www.gstatic.com; frame-src 'self' https://www.google.com; connect-src 'self'; | 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 | — | 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 | — | 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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