| Wikipedia audio article (formerly is an
archive site which stores snapshots of web pages. It retrieves one page at a time similar to
WebCite, smaller than 50 MB each, but with Web 2.0 sites (such as Google Maps and Twitter)
included. uses headless browsing to record
what embedded resources need to be captured to provide a high-quality memento, and creates
a PNG image to provide a static and non-interactive visualization of the representation.Unlike
crawlers such as Wayback Machine, only captures individual pages in response
to explicit user requests, and so does not obey the robots exclusion standard. Because of this, website owners cannot unilaterally
remove snapshots at will, making it a “permanent” archive.Since July 2013, supports
the Memento Project application programming interface (API).==Worldwide availability=====China===According to, has
been blocked in China since March 2016, since September 2017, and since
July 2018.===Finland===On July 21, 2015, the operators blocked access
to the service from all Finnish IP addresses, stating on Twitter that they did this in order
to avoid escalating a dispute they allegedly had with the Finnish government.===Russia===In Russia, only HTTP access is possible; HTTPS
connections are blocked.==Hosting==
The site was protected by Cloudflare from August 16 2018 until September 2 2018.==Features== records only text and images, excluding video and other non-static content. It keeps track of the history of snapshots
saved, returning to the user a request for confirmation before adding a new snapshot
of an already saved Internet address.At November 2018, codifies snapshots with an
alphanumeric case-sensitive code of five elements. Hence, any element may have one of 42 possible
values, between: ten digits, from 0 to 9. 32 letters, 16 of the English alphabet, whose
number is doubled by 16 capital letter.The global amount of possible combinations is
given by the conditional probability theorem, as follows: 42 5=
130.691 {\displaystyle 42^{5}=130.691}
milions of identifiers. The number of available URIs can be additionally
extended with the use of plus and minus, colon, underscore or slash signs. Web pages can’t be duplicated from
to as second-level backup. The reverse – from to
– is possible, but the copy usually takes more time than a direct capture. Some web sites can’t be saved by either Internet
Archive or due to their robots.txt file. The research toolbar enables advanced keywords
operators, using * as the wildcard character. A couple of quotation marks address the search
to an exact sequence of keywords present in the title or in the body of the webpage, whereas
the insite operator restricts it to a specific Internet domain. Once a web page is archived, it cannot be
deleted directly by any Internet.==See also==
Digital preservation Link rot Web archiving
WebCite Internet Archive==References====External links==
Official website

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