Re: [squid-users] [Help] Reverse Proxy: suspend bulk requests for invalid urls

 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_at_treenet.co.nz>
> 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
>>  Current Stable Squid 2.7.STABLE9 or 3.1.12
>>  Beta testers wanted for 3.2.0.7 and 3.1.12.1
>>
Received on Wed May 11 2011 - 03:13:03 MDT