---
set: 4
code: 411
title: Length Required
references:
    "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"
---

The server refuses to accept the request without a defined Content-Length<sup>[1](#ref-1)</sup>.

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.

---

* <span id="ref-1"><sup>1</sup> Content-Length [RFC7230 Section 3.3.2][2]</span>
* Source: [RFC7231 Section 6.5.10][1]

[1]: <http://tools.ietf.org/html/rfc7231#section-6.5.10>
[2]: <http://tools.ietf.org/html/rfc7230#section-3.3.2>