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  2. 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

  3. 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 ...

  4. Fix problems sending AOL Mail - AOL Help

    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.

  5. Constrained Application Protocol - Wikipedia

    en.wikipedia.org/wiki/Constrained_Application...

    When bound to UDP, the entire message must fit within a single datagram. When used with 6LoWPAN as defined in RFC 4944, messages should fit into a single IEEE 802.15.4 frame to minimize fragmentation. The smallest CoAP message is 4 bytes in length, if the token, options and payload fields are omitted, i.e. if it only consists of the CoAP header.

  6. HTTP - Wikipedia

    en.wikipedia.org/wiki/HTTP

    An HTTP/1.1 request made using telnet. The request message, response header section, and response body are highlighted. HTTP defines methods (sometimes referred to as verbs, but nowhere in the specification does it mention verb) to indicate the desired action to be performed on the identified resource. What this resource represents, whether pre ...

  7. Heartbleed - Wikipedia

    en.wikipedia.org/wiki/Heartbleed

    The RFC 6520 Heartbeat Extension tests TLS/DTLS secure communication links by allowing a computer at one end of a connection to send a Heartbeat Request message, consisting of a payload, typically a text string, along with the payload's length as a 16-bit integer. The receiving computer then must send exactly the same payload back to the sender.

  8. Web service - Wikipedia

    en.wikipedia.org/wiki/Web_service

    A web service (WS) is either: . a service offered by an electronic device to another electronic device, communicating with each other via the Internet, or; a server running on a computer device, listening for requests at a particular port over a network, serving web documents (HTML, JSON, XML, images).

  9. Markdown - Wikipedia

    en.wikipedia.org/wiki/Markdown

    The message format of such ActivityPub objects that can be consumed as messages is text/x.misskeymarkdown. The Mozilla Thunderbird email client supports Markdown through the "Markdown here Revival" add-on. Nextcloud Notes: the default app for taking notes on the Nextcloud platform supports formatting using Markdown [57]