Inconsistent gzip'ing of object...

[Chris Woodfield <rekoil@xxxxxxxxxxxxx>]

Hi,

We have a farm of squid servers (2.6STABLE18) sitting behind a load  
balancer, all with identical configurations but obviously their own  
cache disks. We're noticing that some servers are honoring "Accept- 
Encoding: gzip" on particular objects, but not others. The effect is,  
some servers deliver the object gzip'ed but others do not.

Further poking suggests that this is due to how the object is  
delivered when it is first loaded into the cache. For example, when I  
purge the object from the server that is not delivering the object  
gzip'ed, then request it, the miss results in the object being gzip'ed  
on deliver. Worse, when I remove the "Accept-Encoding: gzip" header  
from subsequent requests, I still get the gzip'ed object.

Is this due to incomplete gzip support in squid 2.6? I'm guessing  
what's happening here is that squid is ignoring the header and passing  
it along verbatim to the origin, which delivers gzip'ed content. What  
is the current state for gzip support in 2.7 or 3.0?

Thanks,

-C