If-Modified-Since HTTP Header在请求是HEAD时返回什么样的响应？ [英] What response should If-Modified-Since HTTP Header return if request is HEAD?

问题描述

如果您发送带有If-Modified-Since标头的GET请求，服务器支持它并且文件没有更改，则服务器将返回304响应。

如果您在相同的情况下发送了HEAD请求，服务器是否应发送304响应或发回您将发送的文件已更改的完整标题？

简而言之：在请求一个没有改变的文件时，GET / HEAD是否等价？ RFC

HEAD方法与GET
相同，除了服务器不能在响应中返回
a message-body。包含在HTTP
头文件中的
metainformation响应HEAD请求
应该与为响应GET请求而发送的信息
相同。

基于上述情况，相同情况下的HEAD请求应该返回304.

总之：请求一个没有更改
的文件时，GET / HEAD是否等于
？

<再次，根据RFC的说法，GET和HEAD应该是相同的。

If you send a GET request with an If-Modified-Since header, the server suports it and the file hasn't changed, the server will return a 304 response.

If you sent a HEAD request in the same circumstances, should the server send a 304 response or send back the full headers you would have sent had the file changed?

In short: is GET / HEAD equivalent when requesting a file that has not changed?

解决方案

As per RFC

The HEAD method is identical to GET 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.

Based on the above, the HEAD request in the same circumstances should return 304.

In short: is GET / HEAD equivalent when requesting a file that has not changed?

Again, based on what the RFC has to say, both GET and HEAD should be equivalent.

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