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Referrer-Policy

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Referrer-Policy 首部用来监管哪些访问来源信息——会在 Referer  中发送——应该被包含在生成的请求当中。

Header type Response header
Forbidden header name no

语法

注意 Referer 实际上是单词 "referrer" 的错误拼写。Referrer-Policy 这个首部并没有延续这个错误拼写。

Referrer-Policy: no-referrer
Referrer-Policy: no-referrer-when-downgrade
Referrer-Policy: origin
Referrer-Policy: origin-when-cross-origin
Referrer-Policy: same-origin
Referrer-Policy: strict-origin
Referrer-Policy: strict-origin-when-cross-origin
Referrer-Policy: unsafe-url

指令

no-referrer
整个 Referer  首部会被移除。访问来源信息不随着请求一起发送。
no-referrer-when-downgrade (默认值)
在没有指定任何策略的情况下用户代理的默认行为。在同等安全级别的情况下,引用页面的地址会被发送(HTTPS->HTTPS),但是在降级的情况下不会被发送 (HTTPS->HTTP)。
origin
在任何情况下,仅发送文件的源作为引用地址。例如  https://example.com/page.html 会将 https://example.com/ 作为引用地址。
origin-when-cross-origin
对于同源的请求,会发送完整的URL作为引用地址,但是对于非同源请求仅发送文件的源。
same-origin
对于同源的请求会发送引用地址,但是对于非同源请求则不发送引用地址信息。
strict-origin
在同等安全级别的情况下,发送文件的源作为引用地址(HTTPS->HTTPS),但是在降级的情况下不会发送 (HTTPS->HTTP)。
strict-origin-when-cross-origin
对于同源的请求,会发送完整的URL作为引用地址;在同等安全级别的情况下,发送文件的源作为引用地址(HTTPS->HTTPS);在降级的情况下不发送此首部 (HTTPS->HTTP)。
unsafe-url
无论是同源请求还是非同源请求,都发送完整的 URL(移除参数信息之后)作为引用地址。
这项设置会将受 TLS 安全协议保护的资源的源和路径信息泄露给非安全的源服务器。进行此项设置的时候要慎重考虑。

示例

Policy Document Navigation to Referrer
no-referrer https://example.com/page.html any domain or path no referrer
no-referrer-when-downgrade https://example.com/page.html https://example.com/otherpage.html https://example.com/page.html
no-referrer-when-downgrade https://example.com/page.html https://mozilla.org https://example.com/page.html
no-referrer-when-downgrade https://example.com/page.html http://example.org no referrer
origin https://example.com/page.html any domain or path https://example.com/
origin-when-cross-origin https://example.com/page.html https://example.com/otherpage.html https://example.com/page.html
origin-when-cross-origin https://example.com/page.html https://mozilla.org https://example.com/
origin-when-cross-origin https://example.com/page.html http://example.com/page.html https://example.com/
same-origin https://example.com/page.html https://example.com/otherpage.html https://example.com/page.html
same-origin https://example.com/page.html https://mozilla.org no referrer
strict-origin https://example.com/page.html https://mozilla.org https://example.com/
strict-origin https://example.com/page.html http://example.org no referrer
strict-origin http://example.com/page.html any domain or path http://example.com/
strict-origin-when-cross-origin https://example.com/page.html https://example.com/otherpage.html https://example.com/page.html
strict-origin-when-cross-origin https://example.com/page.html https://mozilla.org https://example.com/
strict-origin-when-cross-origin https://example.com/page.html http://example.org no referrer
unsafe-url https://example.com/page.html any domain or path https://example.com/page.html

规范

Specification Status
Referrer Policy Editor's draft

浏览器兼容性

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support56.050.0(No)(No)(No)(No)
same-origin(No)152.0(No)(No)(No)(No)
strict-origin(No)152.0(No)(No)(No)(No)
strict-origin-when-cross-origin(No)152.0(No)(No)(No)(No)
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support56.0(No)(No)50.0(No)(No)(No)
same-origin(No)(No)(No)52.0(No)(No)(No)
strict-origin(No)(No)(No)52.0(No)(No)(No)
strict-origin-when-cross-origin(No)(No)(No)52.0(No)(No)(No)

1. See Chromium bug 627968.

注意: 从版本 53 起,Gecko 在 about:config 中提供了一项偏好设置,使得用户可以自行设定默认的 Referrer-Policy 值 —— network.http.referer.userControlPolicy 。可选的值包括:

  • 0 — no-referrer
  • 1 — same-origin
  • 2 — strict-origin-when-cross-origin
  • 3 — no-referrer-when-downgrade (the default)

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