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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  3. Error message - Wikipedia

    en.wikipedia.org/wiki/Error_message

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  4. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

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  5. Page fault - Wikipedia

    en.wikipedia.org/wiki/Page_fault

    The operating system delays loading parts of the program from disk until the program attempts to use it and the page fault is generated. If the page is not loaded in memory at the time of the fault, then it is called a major or hard page fault. The page fault handler in the OS needs to find a free location: either a free page in memory, or a ...

  6. 2021 Facebook outage - Wikipedia

    en.wikipedia.org/wiki/2021_Facebook_outage

    Major DNS resolvers returning "SERVFAIL" status for Facebook.com. Security experts identified the problem as a Border Gateway Protocol (BGP) withdrawal of the IP address prefixes in which Facebook's Domain Name System (DNS) servers were hosted, making it impossible for users to resolve Facebook and related domain names, and reach services.

  7. Facebook outage caused by error during maintenance work ... - AOL

    www.aol.com/facebook-outage-caused-error-during...

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  8. Logging (computing) - Wikipedia

    en.wikipedia.org/wiki/Logging_(computing)

    Specifically, a transaction log is a log of the communications between a system and the users of that system, [2] or a data collection method that automatically captures the type, content, or time of transactions made by a person from a terminal with that system. [3] For Web searching, a transaction log is an electronic record of interactions ...

  9. HTTP 451 - Wikipedia

    en.wikipedia.org/wiki/HTTP_451

    This is intended to identify the entity implementing the blocking (an ISP, DNS provider, caching system, etc.), not the legal authority mandating the block. [15] At an IETF hackathon, participants used a web crawler to discover that several implementations misunderstood this header and gave the legal authority instead. [16]