WebSocket Notes

ws.md

Notes

WebSocket Protocol is an Application Layer protocol that enables a client and server to send and receive messages simultaneously through a full duplex stream over one TCP/IP connection on port 80 or 443.

Default WebSocket protocol client request, and server response:

• send HTTP/1.1 GET

  GET /chat HTTP/1.1
  
  Host: server.example.com
  
  Upgrade: websocket
  
  Connection: Upgrade
  
  Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==
  
  Sec-WebSocket-Protocol: chat, superchat
  
  Sec-WebSocket-Version: 13
  
  Origin: http://example.com
  

• Server responds with HTTP/1.1 code 101 Switching Protocols

  HTTP/1.1 101 Switching Protocols
  
  Upgrade: websocket
  
  Connection: Upgrade
  
  Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk=
  
  Sec-WebSocket-Protocol: chat