commit 74001ffe478705d5ece395f8af9b6b1285b3d7f7
author Piotr Sikora <piotr@cloudflare.com> Wed Nov 26 18:35:37 2014 -0800
committer Piotr Sikora <piotr@cloudflare.com> Wed Nov 26 18:35:37 2014 -0800
tree 606ba25d6362ec3adc5f45c62f0f0a4a2faf0fd2
parent 16458fc8294cc3ac12ff462d6c4326fe9d6fb9ba

Cache: send conditional requests only for cached 200/206 responses.

RFC7232 says:

   The 304 (Not Modified) status code indicates that a conditional GET
   or HEAD request has been received and would have resulted in a 200
   (OK) response if it were not for the fact that the condition
   evaluated to false.

which means that there is no reason to send requests with "If-None-Match"
and/or "If-Modified-Since" headers for responses cached with other status
codes.

Also, sending conditional requests for responses cached with other status
codes could result in a strange behavior, e.g. upstream server returning
304 Not Modified for cached 404 Not Found responses, etc.

Signed-off-by: Piotr Sikora <piotr@cloudflare.com>