HTTP 标头字段“Content-Location"的用途是什么? [英] What is the purpose of the HTTP header field “Content-Location”?

问题描述

对我的问题的评论感到困惑/启发 搜索引擎是否尊重 HTTP 标头字段Content-Location"?，我想知道 Content-Location HTTP 中的标头字段 是以及如何使用它.

Confused/inspired by a comment to my question Do search engines respect the HTTP header field "Content-Location"?, I’d like to know, what the exact purpose of the Content-Location header field in HTTP is and how it can be used.

推荐答案

响应 GET 请求，HTTP 中的 Content-Location 可以在请求的资源有多个可用表示时使用，例如多种语言.返回的资源的选择将取决于原始 GET 请求中的 Accept 标头.

In response to a GET request, Content-Location in HTTP can be used when a requested resource has multiple representations available, e.g. multiple languages. The selection of the resource returned will depend on the Accept headers in the original GET request.

通常，Content-Location 标头中指定的位置与原始请求的 URI 中指定的位置不同.

Usually, the location specified in the Content-Location header is different to the location specified in the original request's URI.

响应 PUT 或 POST 请求，

In response to a PUT or POST request,

• 如果 Content-Location URI 与请求的 URI 不同，则指定 URI 处的缓存条目无效.(见 https://www.rfc-editor.org/rfc/rfc7234#第 4.4 节 和 https://www.rfc-editor.org/rfc/rfc2616#section-13.10)
• 如果 Content-Location URI 与请求的 URI 相同，则表明缓存对 PUT/POST 请求的响应与对 GET 请求的 200 响应将收到的响应相同相同的位置，因此可以被缓存.(见 https://www.rfc-editor.org/rfc/rfc7231#section-3.1.4.2) 请注意，Firefox 和 Chrome 似乎没有实现这一点.

• If the Content-Location URI is different than the requested URI, then the cache entry at the indicated URI is invalidated. (see https://www.rfc-editor.org/rfc/rfc7234#section-4.4 and https://www.rfc-editor.org/rfc/rfc2616#section-13.10)
• If the Content-Location URI is the same as the requested URI, then that indicates to caches that the response to the PUT/POST request is the same as the response that would be received by a 200 response to a GET request at the same location and can thus be cached. (see https://www.rfc-editor.org/rfc/rfc7231#section-3.1.4.2) Note that Firefox and Chrome do not appear to implement this.

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