带有HEAD请求的Content-Length标头？ [英] Content-Length header with HEAD requests?

问题描述

http规范说明 HEAD 请求：

HEAD方法与GET相同，但服务器不能返回响应中的消息正文。响应HEAD请求的HTTP头中包含的元信息应该与响应GET请求时发送的信息相同。

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.

对 HEAD 请求的响应是否应包含 Content-Length 标头？它应该是在 GET 请求中返回的值，即使没有响应正文吗？或者Content-Length应该是0？

Should the response to a HEAD request contain a Content-Length header? Should it be the value which would be returned on a GET request, even if there is no response body? Or should the Content-Length be 0?

推荐答案

对我而言，它看起来像 HTTP 1.1 RFC 非常具体：

To me it looks like the HTTP 1.1 RFC is pretty specific:

Content-Length
entity-header字段表示实体主体的大小，以十进制
个数量的OCTET发送给收件人，或者在在HEAD
方法的情况下，本来发送的实体主体的大小为
请求为GET 。

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