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  2. Fix problems sending AOL Mail

    help.aol.com/articles/aol-mail-troubleshooting

    If you see an image challenge question when sending mail, you should just be able to complete the challenge then send mail. If, however, you correctly answer the image challenge and still can't send mail, it could be a sign of a more serious issue with your account, which may require additional steps to secure your account.

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient.

  4. npm left-pad incident - Wikipedia

    en.wikipedia.org/wiki/Npm_left-pad_incident

    Koçulu published left-pad on npm, the default package manager for Node.js, a JavaScript runtime environment. [4] [2] Despite its relative obscurity, left-pad was heavily used; the package was used as a dependency by thousands of other software projects and reached over 15 million downloads prior to its removal.

  5. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  6. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The server attempted to access another server in attempting to process the request, and did not receive a prompt response. [1]: §21.5.5 505 Version Not Supported The SIP protocol version in the request is not supported by the server. [1]: §21.5.6 513 Message Too Large The request message length is longer than the server can process.

  7. 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

  8. Node.js - Wikipedia

    en.wikipedia.org/wiki/Node_js

    Traditionally, relatively heavyweight OS processes or threads handled each connection. Node.js uses an event loop for concurrent I/O, instead of processes or threads. [59] In contrast to other event-driven servers, [which?] Node.js's event loop does not need to be called explicitly. Instead, callbacks are defined, and the server automatically ...

  9. NACK-Oriented Reliable Multicast - Wikipedia

    en.wikipedia.org/wiki/NACK-Oriented_Reliable...

    These messages serve to collect round-trip timing, gather and send data related to congestion control, synchronize repair windows, and make notifications of a sender's status. There is a core set of specified and enumerated NORM_CMD messages, as well as a range other available types for application-specific use.