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http

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  1. HEAD - HTTP | MDN

    The HEAD Http method requests the metadata of a resource in the form of headers that the server would have sent if the GET method was used instead. This method can be used in cases where a URL might produce a large download, for example, a HEAD request can read the Content-Length header to check the file size before downloading the file with a GET....Русский 中文 (简体) 正體中文 (繁體) The HEAD HTTP method requests the metadata...No Syntax http HEAD <request-target>["?"<query>] HTTP/1.1 <request-target>...

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  2. Refresh - HTTP | MDN

    The Http Refresh response header directs a web browser to either refresh or redirect the page when a specified amount of time has passed after the page was fully loaded. It is exactly equivalent to using Http-equiv="refresh" content="..."> in HTML....Remember language Deutsch The HTTP Refresh response header directs...exactly equivalent to using <meta http-equiv="refresh" content=".....

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  3. Trailer - HTTP | MDN

    The Http Trailer request and response header allows the sender to include additional fields at the end of chunked messages in order to supply metadata that might be dynamically generated while the message body is sent....Português (do Brasil) 中文 (简体) The HTTP Trailer request and response...Warning: Developers cannot access HTTP trailers via the Fetch API or...

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  4. Allow - HTTP | MDN

    The Http Allow response header lists the set of request methods supported by a resource. This header must be sent if the server responds with a 405 Method Not Allowed status code to indicate which request methods can be used instead. An empty Allow value indicates that the resource allows no request methods, which might occur temporarily for a given resource....Brasil) 中文 (简体) 正體中文 (繁體) The HTTP Allow response header lists...No Syntax http Allow: <http-methods> Directives <http-methods>...

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  5. Accept - HTTP | MDN

    The Http Accept request and response header indicates which content types, expressed as MIME types, the sender is able to understand. In requests, the server uses content negotiation to select one of the proposals and informs the client of the choice with the Content-Type response header. In responses, it provides information about which content types the server can understand in messages to the requested resource, so that the content type can be used in subsequent requests to the resource....Русский 中文 (简体) 正體中文 (繁體) The HTTP Accept request and response...except for Tab 0x09 . Syntax http Accept: <media-type>/<MIME_subtype>...

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  6. Downlink - HTTP | MDN

    The Http Downlink request header is used in Client Hints to provide the approximate bandwidth in Mbps of the client's connection to the server.... The HTTP Downlink request header is used...different value of the header (see HTTP Caching Vary ). Even if Downlink...

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  7. RTT - HTTP | MDN

    The Http RTT request header is a network client hint which provides the approximate round trip time on the application layer, in milliseconds. The RTT hint includes server processing time, unlike transport layer RTT.... The HTTP RTT request header is a network...different value of the header (see HTTP Caching Vary ). Even if RTT...

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  8. Origin - HTTP | MDN

    The Http Origin request header indicates the origin (scheme, hostname, and port) that caused the request. For example, if a user agent needs to request resources included in a page, or fetched by scripts that it executes, then the origin of the page may be included in the request....Brasil) Русский 中文 (简体) The HTTP Origin request header indicates...Forbidden header name Yes Syntax http Origin: null Origin: <scheme>://<hostname>...

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  9. ECT - HTTP | MDN

    The Http ECT request header is used in Client Hints to indicate the effective connection type: slow-2g, 2g, 3g, or 4g.... The HTTP ECT request header is used in...Forbidden header name No Syntax http ECT: <value> Directives <value>...

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  10. ETag - HTTP | MDN

    The Http ETag (entity tag) response header is an identifier for a specific version of a resource. It lets caches be more efficient and save bandwidth, as a web server does not need to resend a full response if the content has not changed. Additionally, ETags help to prevent simultaneous updates of a resource from overwriting each other ("mid-air collisions")....Русский 中文 (简体) 正體中文 (繁體) The HTTP ETag (entity tag) response header...Forbidden header name No Syntax http ETag: W/"<etag_value>" ETag:...

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