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From Brendan Webb <>
Subject Re: Missing Cache-Control header
Date Mon, 10 Mar 2014 16:52:07 GMT
Finally did hunt down the cause of the problem. Glad to report it wasn't ATS related.

Turns out, our third party CMS had started flushing HTTP responses before our end-of-reponse
header setting was processing. We've since adjusted our code to fire earlier in the request
and voila, problem solved.

On Feb 25, 2014, at 2:04 PM, Brendan Webb <<>>

I've recently started to notice that some requests made by ATS to my origin servers are completely
missing the Cache-Control header in the response. Functionality seems unaffected, but the
missing header is somewhat concerning. Wondering if others have seen this behavior too as
I'm having a heck of a time tracking down the cause.

Things I've done recently which may have caused this:

  *   upgraded ATS from 3.0.4 to 4.1.2
  *   switched remap.config from using map/reverse_map combos to one way map + pristine host
  *   using rfc5861 plugin for stale-while-revalidate and stale-if-error functionality

Hmmm, not sure what ATS possibly could do to prevent the origin from sending the Cache-Control:
header. Are you sure it’s not something on the origin side that’s trying to detect the
UA (maybe using the Via: header?) and responds without the CC: ?

— Leif

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