rfc2616

Content-Length entity-header 字段表示entity-body，十进制的八进制数，发送给接收者，或者，在在 HEAD 方法的情况下，实体主体的大小将如果请求是 GET，则已发送.

The Content-Length entity-header field indicates the size of the entity-body, in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.

内容类型是什么并不重要.

It doesn't matter what the content-type is.

以下帖子处的扩展.