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HTTP 411 Length Required客户端错误响应代码指示服务器在没有定义的Content-Length头部的情况下拒绝接受请求。

请注意，根据规范，在一系列块中发送数据时，Content-Length头部将被忽略，并且在每个块的开始处，您需要以十六进制格式添加当前块的长度。查看Transfer-Encoding更多细节。

状态

411 Length Required

规范

规范	标题
RFC 7231，第6.5.10节：411长度要求	超文本传输协议（HTTP / 1.1）：语义和内容

也可以看看

Content-Length

Transfer-Encoding

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