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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. A user agent may automatically redirect a request.

  3. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    reCAPTCHA Inc. [1] is a CAPTCHA system owned by Google.It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images.

  4. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford. [2] It is a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." [3] A historically common type of CAPTCHA (displayed as reCAPTCHA v1) was first invented in 1997 by two groups working in parallel. This ...

  5. List of SMTP server return codes - Wikipedia

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

    5.XXX.XXX Permanent Failure: Not likely to be resolved by resending the message in current form. In general the class identifier MUST match the first digit of the Basic Status Code to which it applies. [1] The subjects are defined as follows: X.0.XXX Other or Undefined Status; X.1.XXX Addressing Status; X.2.XXX Mailbox Status; X.3.XXX Mail ...

  6. Luis von Ahn - Wikipedia

    en.wikipedia.org/wiki/Luis_von_Ahn

    Luis von Ahn (Spanish: [ˈlwis fon ˈan]; born 19 August 1978) is a Guatemalan-American entrepreneur, software developer, and consulting professor in the Computer Science Department at Carnegie Mellon University in Pittsburgh, Pennsylvania.

  7. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Starting with Ruby version 1.9.2 (released on 18 August 2010), the bug with year 2038 is fixed, [16] by storing time in a signed 64-bit integer on systems with 32-bit time_t. [17] Starting with NetBSD version 6.0 (released in October 2012), the NetBSD operating system uses a 64-bit time_t for both 32-bit and 64-bit

  8. Solar eclipse of September 2, 2035 - Wikipedia

    en.wikipedia.org/wiki/Solar_eclipse_of_September...

    A total solar eclipse will occur at the Moon's ascending node of orbit on Sunday, September 2, 2035, [1] with a magnitude of 1.032. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth.

  9. 235 (number) - Wikipedia

    en.wikipedia.org/wiki/235_(number)

    235 (two hundred [and] thirty-five) is the integer following 234 and preceding 236.. Additionally, 235 is: a semiprime; a heptagonal number [1]; a centered triangular number [2] ...