Via 是一个通用首部，是由代理服务器添加的，适用于正向和反向代理，在请求和响应首部中均可出现。这个消息首部可以用来追踪消息转发情况，防止循环请求，以及识别在请求或响应传递链中消息发送者对于协议的支持能力。
语法
Via: [ <protocol-name> "/" ] <protocol-version> <host> [ ":" <port> ]
or
Via: [ <protocol-name> "/" ] <protocol-version> <pseudonym>
指令
- <protocol-name>
- 可选。所使用的协议名称，如 "HTTP"。
- <protocol-version>
- 所使用的协议版本号， 例如 "1.1"。
- <host> and <port>
- 公共代理的URL及端口号。
- <pseudonym>
- 内部代理的名称或别名。
示例
Via: 1.1 vegur
Via: HTTP/1.1 GWA
Via: 1.0 fred, 1.1 p.example.net
规范
浏览器兼容性
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub | Desktop | Mobile |
|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet |
|---|
Via | Chrome
Full support
Yes | Edge
Full support
Yes | Firefox
Full support
Yes | IE
Full support
Yes | Opera
Full support
Yes | Safari
Full support
Yes | WebView Android
Full support
Yes | Chrome Android
Full support
Yes | Edge Mobile
Full support
Yes | Firefox Android
Full support
Yes | Opera Android
Full support
Yes | Safari iOS
Full support
Yes | Samsung Internet Android
Full support
Yes |
|---|
Legend
-
Full support
- Full support
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