Content-Length
Content-Length 是一个实体消息首部，用来指明发送给接收方的消息主体的大小，即用十进制数字表示的八位元组的数目。
| Header type | Entity header |
|---|---|
| Forbidden header name | yes |
语法
Content-Length: <length>
指令
- <length>
- 消息的长度，用十进制数字表示的八位字节的数目。
规范
| Specification | Title |
|---|---|
| RFC 7230, section 3.3.2: Content-Length | Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing |
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