fastly/httpd-2.4 — pull request #3 by jhatala (2014-03-04 02:11:37+00:00)
Title: Option to not remove non-standard header fields from 304 responses

Filter304Headers On : [default] current behavior, only keep
the following header fields in a 304 response:
* Connection
* Keep-Alive
* ETag
* Content-Location
* Expires
* Cache-Control
* Vary
* Warning
* WWW-Authenticate
* Proxy-Authenticate
* Set-Cookie
* Set-Cookie2

Filter304Headers Off: treat 304 no different from other responses
and pass all header fields through

This is for fastly/Ops#42