1. 面向开发者的 Web 技术
  2. HTTP
  3. 参考
  4. HTTP 响应状态码
  5. 426 Upgrade Required

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426 Upgrade Required

426 Upgrade Required 是一种 HTTP 协议的错误状态代码，表示服务器拒绝处理客户端使用当前协议发送的请求，但是可以接受其使用升级后的协议发送的请求。

服务器会在响应中使用 Upgrade 首部来指定要求的协议。

状态

426 Upgrade Required

示例

HTTP/1.1 426 Upgrade Required
Upgrade: HTTP/3.0
Connection: Upgrade
Content-Length: 53
Content-Type: text/plain

This service requires use of the HTTP/3.0 protocol

规范

Specification
HTTP Semantics
# status.426

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