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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. Fix issues with AOL Mail image challenges - AOL Help

    help.aol.com/articles/what-should-i-do-if-i-get...

    If you're still prompted to retake the image challenge multiple times a day, you might have a more serious issue. Check out the Security Center for info about recommended antivirus software and reset your password to make sure it's secure.

  4. 500 error - Wikipedia

    en.wikipedia.org/?title=500_error&redirect=no

    List of HTTP status codes#500 To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .

  5. List of SMTP server return codes - Wikipedia

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

    214 Help message (A response to the HELP command) 220 <domain> Service ready 221 <domain> Service closing transmission channel 221 2.0.0 Goodbye [1] 235 2.7.0 Authentication succeeded [3] 240 QUIT 250 Requested mail action okay, completed 251 User not local; will forward 252 Cannot verify the user, but it will try to deliver the message anyway

  6. Repetition code - Wikipedia

    en.wikipedia.org/wiki/Repetition_code

    In coding theory, the repetition code is one of the most basic linear error-correcting codes. In order to transmit a message over a noisy channel that may corrupt the transmission in a few places, the idea of the repetition code is to just repeat the message several times. The hope is that the channel corrupts only a minority of these repetitions.

  7. Token (railway signalling) - Wikipedia

    en.wikipedia.org/wiki/Token_(railway_signalling)

    The train could then proceed, and a second train could follow. In the earliest days, the second train could proceed after a designated time interval, as on double lines at the time. However, after the Armagh rail disaster of 1889, block working became mandatory. Seeing the train staff provided assurance that there could be no head-on collision.

  8. Universally unique identifier - Wikipedia

    en.wikipedia.org/wiki/Universally_unique_identifier

    The time 2 48 × 4 μs after 1980 started was 2015-09-05 05:58:26.84262 UTC. Thus, the last time at which UUIDs could be generated in this original format was in 2015. [20] time_low 0x04: 2 octets / 16 bits reserved 0x06: 2 octets / 16 bits These octets are reserved for future use. family 0x08: 1 octet / 8 bits This octet is an address family ...

  9. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    RFC 2228 introduced the concept of protected replies to increase security over FTP communications. The 6xx replies are Base64 encoded protected messages that serves as responses to secure commands. When properly decoded, these replies fall into the above categories.