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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]
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]
When visiting a web page, the referrer or referring page is the URL of the previous web page from which a link was followed. More generally, a referrer is the URL of a previous item which led to this request. For example, the referrer for an image is generally the HTML page on which it is to be displayed.
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.
Web site owners who do not want search engines to deep link, or want them only to index specific pages can request so using the Robots Exclusion Standard (robots.txt file). People who favor deep linking often feel that content owners who do not provide a robots.txt file are implying by default that they do not object to deep linking either by ...
Tagged PDF is not required in situations where a PDF file is intended only for print. Since the feature is optional, and since the rules for tagged PDF were relatively vague in ISO 32000-1, support for tagged PDF among consuming devices, including assistive technology (AT), is uneven as of 2021. [33]
Encapsulated PostScript file version 3.0 [34] 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 31 20 45 50 53 46 2D 33 2E 30 %!PS-Adobe-3.1 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.1 [35] 49 54 53 46 03 00 00 00 60 00 00 00: ITSF␃␀␀␀`␀␀␀ 0 chm MS Windows HtmlHelp Data: 3F 5F?_ 0 hlp Windows 3.x/95/98 Help file 25 50 44 46 ...
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 ...