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plack / Plack

PSGI toolkit and server adapters
http://plackperl.org/
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Lint checks for Content-Length or Body on Status with no Body #592

Open haarg opened 7 years ago

miyagawa commented 7 years ago

Looking at the spec, it seems it is allowed to send Content-Length to 304, in a way that it sends the exact same value for the original 200 response. I would say this is extremely rare with a PSGI application, but seems invasive for a framework to restrict that.

https://tools.ietf.org/html/rfc7230#section-3.3.2

   A server MAY send a Content-Length header field in a 304 (Not
   Modified) response to a conditional GET request (Section 4.1 of
   [RFC7232]); a server MUST NOT send Content-Length in such a response
   unless its field-value equals the decimal number of octets that would
   have been sent in the payload body of a 200 (OK) response to the same
   request.
   A server MUST NOT send a Content-Length header field in any response
   with a status code of 1xx (Informational) or 204 (No Content).  A
   server MUST NOT send a Content-Length header field in any 2xx
   (Successful) response to a CONNECT request (Section 4.3.6 of
   [RFC7231]).