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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The response provided by a cache is stale (the content's age exceeds a maximum age set by a Cache-Control header or heuristically chosen lifetime). 111 Revalidation Failed The cache was unable to validate the response, due to an inability to reach the origin server. 112 Disconnected Operation

  3. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  4. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    In 2013, reCAPTCHA began implementing behavioral analysis of the browser's interactions to predict whether the user was a human or a bot. The following year, Google began to deploy a new reCAPTCHA API, featuring the "no CAPTCHA reCAPTCHA"—where users deemed to be of low risk only need to click a single checkbox to verify their identity. A ...

  5. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  6. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The request could not be understood due to malformed syntax. [1]: §21.4.1 401 Unauthorized The request requires user authentication. This response is issued by UASs and registrars. [1]: §21.4.2 402 Payment Required Reserved for future use. [1]: §21.4.3 403 Forbidden The server understood the request, but is refusing to fulfill it.

  7. List of Google April Fools' Day jokes - Wikipedia

    en.wikipedia.org/wiki/List_of_Google_April_Fools...

    Due to the large-scale devastation from the 2011 Tōhoku earthquake and tsunami, in lieu of a traditional April Fools' hoax, Google Japan featured many never-before featured drawings from its 2009 Google Doodle competition, themed "What I Love About Japan" drawn by Japanese schoolchildren, saying "We promised that only the top prize winners ...

  8. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...

  9. Google - Wikipedia

    en.wikipedia.org/wiki/Google

    On October 8, 2018, a class action lawsuit was filed against Google and Alphabet due to "non-public" Google+ account data being exposed as a result of a bug that allowed app developers to gain access to the private information of users. The litigation was settled in July 2020 for $7.5 million with a payout to claimants of at least $5 each, with ...