node.js - Content-Length header 是压缩字节还是未压缩字节的字节大小？

Question

我正在 node.js 中实现静态文件服务。假设我要发送一个名为 party-time.txt 的文件，它是:

100 字节未压缩

gzipped 70 字节

如果我发送 gzipped 文件，Content-Length header 应该是 100 还是 70？

Answer 1

请看specification .它明确指出:

Applications SHOULD use this field to indicate the transfer-length of the message-body, unless this is prohibited by the rules in section 4.4.

深入挖掘:

The message-body (if any) of an HTTP message is used to carry the
entity-body associated with the request or response. The message-body differs from the entity-body only when a transfer-coding has been
applied, as indicated by the Transfer-Encoding header field (...)

所以，Content-length 就是压缩包的大小。