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  2. 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.

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not [note 1] send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions. 100 Continue

  4. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Servers can optionally send this response to indicate a call is being forwarded. [1]: §21.1.3 182 Queued Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available. A server may send multiple 182 responses to update progress of the queue. [1]: §21.1.4 183 Session Progress

  5. List of websites blocked in mainland China - Wikipedia

    en.wikipedia.org/wiki/List_of_websites_blocked...

    (Chinese version currently deprecated) Equestria Daily equestriadaily.com www.equestriadaily.com Online Community English April 2022 – August 2023 and August 2023 – present Partially blocked, sometimes could be accessed normally, sometimes inaccessible Steam Store: store.steampowered.com store.steampowered.com Entertainment Multilingual

  6. Wikipedia:Server status - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Server_status

    meta:Wikimedia servers#Status and monitoring This page is a soft redirect This page was last edited on 8 April 2023, at 22:38 (UTC). Text is ...

  7. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.

  8. Hybrid automatic repeat request - Wikipedia

    en.wikipedia.org/wiki/Hybrid_automatic_repeat...

    Receivers detecting a corrupted message will request a new message from the sender. In Hybrid ARQ, the original data is encoded with an FEC code, and the parity bits are either immediately sent along with the message or only transmitted upon request when a receiver detects an erroneous message.

  9. Fediverse - Wikipedia

    en.wikipedia.org/wiki/Fediverse

    Users of different websites can send and receive status updates, multimedia files and other data across the network. The term Fediverse is a portmanteau of "federation" and "universe". [4] The majority of Fediverse platforms are free and open-source software, and create connections between servers using the ActivityPub protocol.