消息正文为空时是否应该存在 Content-Type 标头? [英] Should Content-Type header be present when the message body is empty?

问题描述

Content-Type 标头是否应该在没有负载正文时出现在 HTTP 请求或响应中?

Should the Content-Type header be present in an HTTP request or response when there is no payload body?

在这种情况下，HTTP 标头的正确组合是没有 Content-Type 且 Content-Length 为 0，或者应该是 Content-Type 消息没有正文时根本不存在?

Is the correct combination of HTTP headers in this case to have no Content-Type and a Content-Length of 0, or should the Content-Type not be present at all when the message lacks a body?

推荐答案

RFC 7231 说:

生成包含有效负载正文的消息的发送者应该在该消息中生成一个 Content-Type 标头字段 [...]

A sender that generates a message containing a payload body SHOULD generate a Content-Type header field in that message [...]

所以它没有明确说明如果您生成的消息 没有 有有效负载正文该怎么做，但它似乎暗示不发送 Content-Type 标头会在这种情况下是合适的.

So it doesn't say explicitly what to do if you're generating a message that doesn't have a payload body, but it certainly seems implied that not sending a Content-Type header would be appropriate in that case.

Content-Length: 0 是您向接收者指示不会有正文的方式，除非您使用诸如分块编码之类的东西.

Content-Length: 0 is how you would indicate to the receiver that there will be no body, unless you're using something like chunked encoding.

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