Network - WebSocket Protocol

1 - About

WebSocket is a protocol that provides full-duplex communication channels between:

with lower overheads, facilitating real-time data transfer from and to the server.

3 - Implementation

WebSocket is running over a single TCP connection where:

  • The server can send content to the client without being first requested by the client.
  • The communications are done over TCP port number 80 (or 443 in the case of TLS-encrypted connections)

Websocket is located at layer 7 in the OSI model (and, as such, depend on TCP at layer 4)

RFC 6455 states that WebSocket is designed to:

Similar two-way browser-server communications have been achieved in non-standardized ways using stopgap technologies such as Comet.

4 - Standardization

The WebSocket:

  • protocol was standardized by the IETF as RFC 6455 in 2011,
  • API in Web IDL is being standardized by the W3C.

5 - Usage

Push real-time updates such as:

  • notifications,
  • vote counts,
  • new answers
  • comments

6 - Library

7 - Example

8 - Documentation / Reference

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