| Strict-Transport-Security | max-age=31556926; 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 | base-uri 'none'; connect-src 'self' https://api.stripe.com https://errors.stripe.com https://js.stripe.com https://r.stripe.com https://checkout-cookies.stripe.com https://stripe.com/cookie-settings/enforcement-mode https://merchant-ui-api.stripe.com; default-src 'self'; font-src 'self' https://js.stripe.com; form-action 'none'; frame-src 'self' https://js.stripe.com https://payments.stripe.com https://checkout.link.com; img-src 'self' https://q.stripe.com https://js.stripe.com https://stripe-camo.global.ssl.fastly.net https://d1wqzb5bdbcre6.cloudfront.net https://qr.stripe.com https://b.stripecdn.com https://files.stripe.com; media-src 'none'; object-src 'none'; script-src 'self' https://js.stripe.com 'sha256-BNulBYV1JXGvq9NQg7814ZyyVZCqfRI1aq5d+PSIdgI=' 'sha256-PO350kkDh2mSinBso5V7/NIHhtBcajPfQweP7XrBNtM=' 'sha256-4EiYDM+04zfzXYN6AO7/QifPCsUVxqK5P9lipLlOVGI='; style-src 'self' https://js.stripe.com 'sha256-0wCsuxti3m6dSdXFrCFETD2dpAVJPkB2rNReo7a96ME='; worker-src 'none'; report-uri https://q.stripe.com/csp-report | 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 | — | 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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