Age HTTP Header - Original Server Response
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The Age header contains the time in seconds the object has been in a proxy cache.
Cloudflare Certificate Transparency
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The Expect-CT header allows sites to opt in to reporting and/or enforcement of Certificate Transparency requirements, which prevents the use of misissued certificates for that site from going unnoticed.
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schema.org micro-markup
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Schema.org is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet, on web pages, in email messages, and beyond.
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Vary Header check for User-Agent
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When using the Vary: User-Agent header, caching servers should consider the user agent when deciding whether to serve the page from cache
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Vary Header Accept-Encoding
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The Accept-Encoding request HTTP header advertises which content encoding, usually a compression algorithm, the client is able to understand. Using content negotiation, the server selects one of the proposals, uses it and informs the client of its choice with the Content-Encoding response header.
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HSTS - Browser HTTPS Only for domain and subdomains
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The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) lets a web site tell browsers that it should only be accessed using HTTPS, instead of using HTTP for domain and subdomains browsers will never connect to your domain using an insecure connection. While the service is hosted by Googlefor 15552000 seconds
Block Content Sniffing
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The X-Content-Type-Options response HTTP header is a marker used by the server to indicate that the MIME types advertised in the Content-Type headers should not be changed and be followed. This allows to opt-out of MIME type sniffing, or, in other words, it is a way to say that the webmasters knew what they were doing.
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