HTTP之HEAD method

最新推荐文章于 2024-09-02 15:41:12 发布

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最新推荐文章于 2024-09-02 15:41:12 发布

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分类专栏：网络安全文章标签： HEAD http

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本文介绍了 HTTP 协议中 HEAD 方法的使用方式及其特点。HEAD 方法类似于 GET 方法，但不返回消息体，仅提供元信息。这使得客户端能够在不下载整个资源的情况下获取资源的最新状态，适用于测试超链接、检查资源修改情况等场景。

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在node中用了一下request.head，发现很少关注过method为HEAD的：

The HEAD method is identical to the GET method except that the server must not return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request should be identical to the information sent in response to a GET request. This allows a client to obtain meta-information about a resource without actually transferring the resource itself.

The head method is often used for testing hyperlinks, accessibility and for determining if a document has been recently modifed.

When your program is implementing caching, it is important to note that if the HEAD response indicates that the cached entity differs from the current entity, such as by a change in the Content-Length, Content-MD5, ETag or Last-Modified, the cache must treat the cached entry as stale.

扩展阅读：

1. http://hc.apache.org/httpclient-3.x/methods/head.html

2. http://condor.depaul.edu/dmumaugh/readings/handouts/SE435/HTTP/node14.html