httpstatuses/contents/codes/411.md

set	code	title	references
4	411	Length Required	Rails HTTP Status Symbol Go HTTP Status Constant :length_required http.StatusLengthRequired

The server refuses to accept the request without a defined Content-Length¹.

The client MAY repeat the request if it adds a valid Content-Length header field containing the length of the message body in the request message.

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• ¹ Content-Length RFC7230 Section 3.3.2
• Source: RFC7231 Section 6.5.10