websocket

Sec-Websocket-Extensions: permessage-deflate; client_max_window_bits
Sec-Websocket-Key: 3jdknZ3cA9awItgV8bJ88A==
Sec-Websocket-Version: 13

• Sec-Websocket-Extensions
  • permessage-deflate - 启用压缩
  • client_max_window_bits - 最大压缩窗口大小
• Sec-Websocket-Key
  • 16 字节随机值
  • 用于验证服务器正确理解 WebSocket
  • 返回 Sec-WebSocket-Accept
• Sec-Websocket-Version
  • 13

curl \
    --include \
    --no-buffer \
    --header "Connection: Upgrade" \
    --header "Upgrade: websocket" \
    --header "Host: example.com:80" \
    --header "Origin: http://example.com:80" \
    --header "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" \
    --header "Sec-WebSocket-Version: 13" \
    http://example.com:80/

WebSockets over HTTP/2

• rfc8441 Bootstrapping WebSockets with HTTP/2
• Chrome 91
• HAProxy 2.4.9 - haproxy#1364
• Golang 暂不支持
  • golang/go#32763
  • nhooyr/websocket#4