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  2. WebSocket - Wikipedia

    en.wikipedia.org/wiki/WebSocket

    The client sends an HTTP request (method GET, version ≥ 1.1) and the server returns an HTTP response with status code 101 (Switching Protocols) on success.This means a WebSocket server can use the same port as HTTP (80) and HTTPS (443) because the handshake is compatible with HTTP.

  3. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Bad SIP Protocol Extension used, not understood by the server. [1]: §21.4.15 421 Extension Required The server needs a specific extension not listed in the Supported header. [1]: §21.4.16 422 Session Interval Too Small The received request contains a Session-Expires header field with a duration below the minimum timer. [11]

  4. Type–length–value - Wikipedia

    en.wikipedia.org/wiki/Type–length–value

    A version 1 system which received a message from a version 2 system would first read the command_c element and then read an element of type callingNumber_c. The version 1 system does not understand callingNumber_c, so the length field is read (i.e. 14) and the system skips forward 14 bytes to read phoneNumberToCall_c

  5. List of IP protocol numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_IP_protocol_numbers

    This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.

  6. Cyclic redundancy check - Wikipedia

    en.wikipedia.org/wiki/Cyclic_redundancy_check

    The following Python code outlines a function which will return the initial CRC remainder for a chosen input and polynomial, with either 1 or 0 as the initial padding. Note that this code works with string inputs rather than raw numbers:

  7. List of TCP and UDP port numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

    Post Office Protocol, version 2 (POP2) [62] 110: Yes: Assigned: Post Office Protocol, version 3 (POP3) [11] [63] [64] 111: Yes: Open Network Computing Remote Procedure Call (ONC RPC, sometimes referred to as Sun RPC) 112: Yes: McIDAS Data Transmission Protocol 113 Yes: No: Ident, authentication service/identification protocol, [11] [65] used by ...

  8. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    Most email software and applications have an account settings menu where you'll need to update the IMAP or POP3 settings. When entering your account info, make sure you use your full email address, including @aol.com, and that the SSL encryption is enabled for incoming and outgoing mail.

  9. EtherType - Wikipedia

    en.wikipedia.org/wiki/EtherType

    EtherType is a two-octet field in an Ethernet frame.It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.