| Strict-Transport-Security | max-age=15552000 | 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 | object-src 'none'; base-uri 'none'; script-src https://cdn.ampproject.org/v0.js https://cdn.ampproject.org/v0/ https://cdn.ampproject.org/viewer/ https://cdn.ampproject.org/rtv/ https://ngastatic.com https://www.googletagmanager.com https://assets.allegrostatic.com https://adservice.google.pl https://adservice.google.com https://pay.google.com https://securepubads.g.doubleclick.net https://ad.doubleclick.net https://allegro.hit.gemius.pl https://connect.facebook.net https://nebula-cdn.kampyle.com https://www.googletagservices.com https://www.gstatic.com/recaptcha/ https://www.google.com/recaptcha/ https://www.recaptcha.net https://www.youtube.com https://player.vimeo.com https://www.googleadservices.com https://s.ytimg.com https://www.google-analytics.com https://secure.payu.com https://secure.przelewy24.pl/js https://maps.googleapis.com 'nonce-nEVdejITx1hx57Wb6krutg==' 'unsafe-inline' 'unsafe-eval' 'strict-dynamic' 'report-sample'; block-all-mixed-content; report-uri https://edge.allegro.pl/seclog/csp; | Good | Control resources the user agent is allowed to load for a given page.
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| Referrer-Policy | — | 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; report=/seclog/xss | Deprecated | Deprecated. Stops pages from loading when they detect reflected cross-site scripting (XSS) attacks.
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| Feature-Policy | ch-width https://a.allegroimg.com | 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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