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author | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
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committer | Peter Bengtsson <mail@peterbe.com> | 2020-12-08 14:40:17 -0500 |
commit | 33058f2b292b3a581333bdfb21b8f671898c5060 (patch) | |
tree | 51c3e392513ec574331b2d3f85c394445ea803c6 /files/zh-cn/web/http/headers/vary | |
parent | 8b66d724f7caf0157093fb09cfec8fbd0c6ad50a (diff) | |
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Diffstat (limited to 'files/zh-cn/web/http/headers/vary')
-rw-r--r-- | files/zh-cn/web/http/headers/vary/index.html | 81 |
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diff --git a/files/zh-cn/web/http/headers/vary/index.html b/files/zh-cn/web/http/headers/vary/index.html new file mode 100644 index 0000000000..51f2c1bec6 --- /dev/null +++ b/files/zh-cn/web/http/headers/vary/index.html @@ -0,0 +1,81 @@ +--- +title: Vary +slug: Web/HTTP/Headers/Vary +translation_of: Web/HTTP/Headers/Vary +--- +<div>{{HTTPSidebar}}</div> + +<p><strong><code>Vary</code></strong> 是一个HTTP响应头部信息,它决定了对于未来的一个请求头,应该用一个缓存的回复(response)还是向源服务器请求一个新的回复。它被服务器用来表明在 <a href="/en-US/docs/Web/HTTP/Content_negotiation">content negotiation</a> algorithm(内容协商算法)中选择一个资源代表的时候应该使用哪些头部信息(headers).</p> + +<p>在响应状态码为 {{HTTPStatus("304")}} <code>Not Modified</code> 的响应中,也要设置 Vary 首部,而且要与相应的 {{HTTPStatus("200")}} <code>OK</code> 响应设置得一模一样。</p> + +<table class="properties"> + <tbody> + <tr> + <th scope="row">Header type</th> + <td>{{Glossary("Response header")}}</td> + </tr> + <tr> + <th scope="row">{{Glossary("Forbidden header name")}}</th> + <td>no</td> + </tr> + </tbody> +</table> + +<h2 id="语法">语法</h2> + +<pre class="syntaxbox notranslate">Vary: * +Vary: <header-name>, <header-name>, ... +</pre> + +<h2 id="说明">说明</h2> + +<dl> + <dt>*</dt> + <dd>所有的请求都被视为唯一并且非缓存的,使用{{HTTPHeader("Cache-Control")}}<code>: no-store</code>,来实现则更适用,这样用于说明不存储该对象更加清晰。</dd> + <dt><header-name></dt> + <dd> 逗号分隔的一系列http头部名称,用于确定缓存是否可用。</dd> +</dl> + +<h2 id="例子">例子</h2> + +<h3 id="动态服务">动态服务</h3> + +<p><code><font face="Open Sans, arial, sans-serif">哪种情况下使用 </font>Vary: 对于User-Agent</code> 头部信息,例如你提供给移动端的内容是不同的,可用防止你客户端误使用了用于桌面端的缓存。 并可帮助Google和其他搜索引擎来发现你的移动端版本的页面,同时告知他们不需要<a href="https://en.wikipedia.org/wiki/Cloaking">Cloaking</a>。</p> + +<pre class="notranslate">Vary: User-Agent</pre> + +<h2 id="定义">定义</h2> + +<table class="standard-table"> + <tbody> + <tr> + <th scope="col">版本</th> + <th scope="col">标题</th> + </tr> + <tr> + <td>{{RFC("7231", "Vary", "7.1.4")}}</td> + <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td> + </tr> + </tbody> +</table> + +<h2 id="浏览器兼容性">浏览器兼容性</h2> + +<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p> + +<p>{{Compat("http.headers.Vary")}}</p> + +<h2 id="更多关于浏览器兼容性:">更多关于浏览器兼容性:</h2> + +<ul> + <li><a href="https://blogs.msdn.microsoft.com/ieinternals/2009/06/17/vary-with-care/">Vary with care – Vary header problems in IE6-9</a></li> +</ul> + +<h2 id="更多">更多</h2> + +<ul> + <li>{{HTTPHeader("Cache-Control")}}</li> + <li>{{HTTPHeader("User-Agent")}}</li> + <li><a href="https://www.fastly.com/blog/best-practices-for-using-the-vary-header">Best Practices for Using the Vary Header – fastly.com</a></li> +</ul> |