Help debugging cacheability / ttl information?
des at linpro.no
Mon Feb 18 00:16:42 CET 2008
Denis Brækhus <denis at startsiden.no> writes:
> What I really am looking for is some help with how to best debug the
> setup with regards to TTLs and cacheability. I'd like to be able to
> inspect a specific cached objects TTL to see if my "set obj.ttl"
> overrides actually work or not. What is the best way to do that?
You should get a varnishlog entry for the TTL computation when an
object is retrieved from the backend, but there won't be a log entry
for VCL changing the TTL...
> On the client I use firebug, so all headers and responess are
> readily available on that end. The reason I don't think everything
> is as it should is that the Age header is very low most of the time.
Instead of Firebug, have you considered using the following:
while :; do
wget -O/dev/null -S http://www.example.com/ 2>&1 | \
grep -i '^age:' ;
sleep 5 ;
> For the record we are still at varnish 1.0.4 [...]
1.0.4 is almost a year old... why not 1.1.2? It has *much* better
support for examining and modifying HTTP headers.
Senior Software Developer
Linpro AS - www.linpro.no
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