favicon.ico
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A favicon, also known as a shortcut icon, website icon, tab icon, URL icon, or bookmark icon, is a file containing one or more small icons, associated with a particular website or web page.
Pragma Header - backwards compatibility with HTTP/1.0
Download List of All Websites using Pragma Header - backwards compatibility with HTTP/1.0
The Pragma HTTP/1.0 general header is an implementation-specific header that may have various effects along the request-response chain. It is used for backwards compatibility with HTTP/1.0 caches where the Cache-Control HTTP/1.1 header is not yet present.
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HTTP Upgrade Header - HTTP/2
Download List of All Websites using HTTP Upgrade Header - HTTP/2
The HTTP Upgrade mechanism is used to establish HTTP/2 starting from plain HTTP. The client starts an HTTP/1.1 connection and sends an Upgrade: h2c header. If the server supports HTTP/2, it replies with HTTP 101 Switching Protocol status code. The HTTP Upgrade mechanism is used only for cleartext HTTP2 (h2c). In the case of HTTP2 over TLS (h2), the ALPN TLS protocol extension is used instead.
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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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Post Cache-Control Header
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this website is using post-heck Cache-Control Header.
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Precheck Cache-Control Header
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this website is using precheck Cache-Control Header.
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Must Revalidate HTTP Cache-Control
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Indicates that once a resource has become stale (e.g. max-age has expired), a cache must not use the response to satisfy subsequent requests for this resource without successful validation on the origin server.
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NO Store HTTP Cache-Control
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The cache should not store anything about the client request or server response.
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No Cache Content
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Forces caches to submit the request to the origin server for validation before releasing a cached copy.
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Meta keywords
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Meta keywords are types of meta tags in the HTML source code of a webpage. They describe the content of a website shortly and concisely,this website is using the following keywords: francia nyelvtanulás, franciatanár, franciatanulás, francia tanfolyam