4×× Client Error

411 Length Required

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.

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

411 Code References

.NET HTTP Status Enum HttpStatusCode.LengthRequired

Rust HTTP Status Constant http::StatusCode::LENGTH_REQUIRED

Rails HTTP Status Symbol :length_required

Go HTTP Status Constant http.StatusLengthRequired

Symfony HTTP Status Constant Response::HTTP_LENGTH_REQUIRED

Python2 HTTP Status Constant httplib.LENGTH_REQUIRED

Python3+ HTTP Status Constant http.client.LENGTH_REQUIRED

Python3.5+ HTTP Status Constant http.HTTPStatus.LENGTH_REQUIRED