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  2. List of HTTP header fields - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_header_fields

    Requests a web application to disable their tracking of a user. This is Mozilla's version of the X-Do-Not-Track header field (since Firefox 4.0 Beta 11). Safari and IE9 also have support for this field. [25] On March 7, 2011, a draft proposal was submitted to IETF. [26] The W3C Tracking Protection Working Group is producing a specification. [27]

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    505 HTTP Version Not Supported The server does not support the HTTP version used in the request. 506 Variant Also Negotiates (RFC 2295) Transparent content negotiation for the request results in a circular reference. [27] 507 Insufficient Storage (WebDAV; RFC 4918) The server is unable to store the representation needed to complete the request. [7]

  4. User-Agent header - Wikipedia

    en.wikipedia.org/wiki/User-Agent_header

    Before migrating to the Chromium code base, Opera was the most widely used web browser that did not have the user agent string with "Mozilla" (instead beginning it with "Opera"). Since July 15, 2013, [ 6 ] Opera's user agent string begins with "Mozilla/5.0" and, to avoid encountering legacy server rules, no longer includes the word "Opera ...

  5. HTTP referer - Wikipedia

    en.wikipedia.org/wiki/HTTP_referer

    Content Security Policy standard version 1.1 introduced a new referrer directive that allows more control over the browser's behaviour in regards to the referrer header. Specifically it allows the webmaster to instruct the browser not to block referrer at all, reveal it only when moving with the same origin etc. [ 16 ]

  6. Help:Cite errors - Wikipedia

    en.wikipedia.org/wiki/Help:Cite_errors

    A list-defined reference with the name "$1" has been invoked, but is not defined in the <references> tag (see the help page). A <ref follow="…"> tag that is the continuation of a previous one can neither be named individually nor extended; Cite error: $1

  7. HTTP/1.1 Upgrade header - Wikipedia

    en.wikipedia.org/wiki/HTTP/1.1_Upgrade_header

    The Upgrade header field is an HTTP header field introduced in HTTP/1.1.In the exchange, the client begins by making a cleartext request, which is later upgraded to a newer HTTP protocol version or switched to a different protocol.

  8. HTTP location - Wikipedia

    en.wikipedia.org/wiki/HTTP_location

    The HTTP Location header field is returned in responses from an HTTP server under two circumstances: To ask a web browser to load a different web page (URL redirection). In this circumstance, the Location header should be sent with an HTTP status code of 3xx. It is passed as part of the response by a web server when the requested URI has:

  9. Persistent identifier - Wikipedia

    en.wikipedia.org/wiki/Persistent_identifier

    After the Internet started to become an important source of information in the 1990s, the issue of citation standards became important in the online world as well. Studies have shown that within a few years of being cited, a significant percentage of web addresses go "dead", [2] [3] a process often called link rot. Using a persistent identifier ...