The HyperText Transfer Protocol (HTTP) 411 Length Required client error response code indicates that the server refuses to accept the request without a defined Content-Length header.
Note: by specification, when sending data in a series of chunks, the Content-Length header is omitted and at the beginning of each chunk you need to add the length of the current chunk in hexadecimal format. See Transfer-Encoding for more details.
411 Length Required
| Specification | Title |
|---|---|
| RFC 7231, section 6.5.10: 411 Length Required | Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/411