On Wed, 11 May 2011 10:01:59 +0700, Le Trung Kien wrote:
Hi, I checked that "negative_ttl" and it's definitely not in my
squid.conf :)
And, I'm also checking our orignial servers for 404 and 30x return
codes if they don't work properly.
I have one more question for sure: Will Squid remembers invalid URLs
(for moment) and return the error page without validating those
invalid URLs against original servers ?
Yes.... I said:
Squid is capable and will cache both 404 replies and 30x redirects
if the
origin sets the headers correctly to allow caching. ie Expires:
header a
year in the future, or Last-Modified some time in the past with
storage
friendly Cache-Control: values.
The bigger problem appears to be that the server is sending some
garbage that produces a 5xx from inside *Squid* ("Invalid Response").
The HTTP standards are being broken. Squid does not cache its own
problem reports.
Thank you, Amos
Kien Le.
On Tue, May 10, 2011 at 7:27 PM, Amos Jeffries <squid3@xxxxxxxxxxxxx>
wrote:
On 10/05/11 20:58, Le Trung Kien wrote:
Hi, we're trying Squid v3 for reverse proxy using, and explore that
we
receive too many access requests for old invalid URLs from client
and
this makes our Squid Caches slow down our original servers by
attempting sending requests to retrieve information from original
servers.
This is from our squid cache.log:
WARNING: HTTP: Invalid Response: No object data received for
invalid_urls AKA invalid_urls
I have questions that:
Is there any way to delay or suspend squid's responding for these
repeated requests after certain times squid cannot retrieve content
for invalid URLs and return a default error page ?
First, make sure that "negative_ttl" directive is *absent* from your
squid.conf
Then fin out why your origin servers are producing garbage instead
of a 404
or 30x reply like they should be.
Squid is capable and will cache both 404 replies and 30x redirects
if the
origin sets the headers correctly to allow caching. ie Expires:
header a
year in the future, or Last-Modified some time in the past with
storage
friendly Cache-Control: values.
Amos
--
Please be using
ÂCurrent Stable Squid 2.7.STABLE9 or 3.1.12
ÂBeta testers wanted for 3.2.0.7 and 3.1.12.1
