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RFC 7231, "Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content", June 2014

Note: This RFC has been obsoleted by RFC 9110

Source of RFC: httpbis (wit)

Errata ID: 5806
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT
Reported By: Anders Kaseorg
Date Reported: 2019-08-12
Held for Document Update by: Francesca Palombini
Date Held: 2021-08-23

Section 4.3.7 says: 

A server MUST generate a Content-Length field with a value of "0" if no
payload body is to be sent in the response.

It should say:

If no payload body is to be sent in the response, a server MUST
generate a status code of 204 (No Content) or a Content-Length field
with a value of "0" (but not both).

Notes:

The original text contradicts RFC 7230 §3.3.2: “A server MUST NOT send a Content-Length header field in any response with a status code of 1xx (Informational) or 204 (No Content)”, unless the intention was to disallow all 204 responses to OPTIONS requests, which I assume it was not.

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