http - HTTP Response中的Content-MD5字段是否通用？

Question

我试过从不同的服务器下载文件，但并非所有服务器都在其 header 中响应 Content-MD5 字段。

我想知道没有资源文件哈希的HTTP响应是否是标准的？

谢谢

Answer 1

The Content-MD5 header field MAY be generated by an origin server or client to function as an integrity check of the entity-body. Only origin servers or clients MAY generate the Content-MD5 header field; proxies and gateways MUST NOT generate it, as this would defeat its value as an end-to-end integrity check. Any recipient of the entity- body, including gateways and proxies, MAY check that the digest value in this header field matches that of the entity-body as receive

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

截至 2014 年 6 月:

The Content-MD5 header field has been removed because it wasinconsistently implemented with respect to partial responses.

RFC 7231 - 超文本传输​​协议(protocol) (HTTP/1.1):语义和内容 - https://www.rfc-editor.org/rfc/rfc7231 (第 92 页)