Re: [squid-users] Config for "multiplexing" non-caching proxy

Chris Woodfield wrote:
> So now that this behavior has a name, I looked and noticed that per the
> 2.7 docs, collapsed_forwarding defaults to off, and isn't enabled in our
> config either. Does running squid in reverse proxy mode implicitly turn
> this on?

Yes. It's designed for primary use in reverse proxies and the setting is
to explicitly turn it on for forward proxies as well.

Amos

>
> -C
>
> On Apr 10, 2009, at 12:26 AM, Amos Jeffries wrote:
>
>> Chris Woodfield wrote:
>>> Hi,
>>> I've noticed that either by design or as a side-effect of squid's
>>> caching that if I request the same object from multiple clients at
>>> the same time, squid will effectively "multiplex" the transfer - that
>>> is, use a single transfer from origin to feed the object to each
>>> client as it receives the incoming http transfer. IMO this is a Good
>>> Thing.
>>> I'm wondering if it's possible to extend this behavior to a
>>> non-caching proxy - this would allow the utilization of squid as a
>>> non-caching CARP proxy while protecting a parent from large numbers
>>> of requests for a single object (which in a CARP setup would normally
>>> all get sent to the same parent, potentially overloading it).
>>> So the goal is to utilize this multiplexing capability in squid while
>>> not actually caching the content. However, testing shows that when I
>>> disable disk caching (via "cache_dir null" or by "maximum_object_size
>>> 0 KB", this behavior is no longer present.
>>
>> Correct. This is the collapsed forwarding feature at work. It
>> currently requires a disk copy to be used as intermediary source so
>> that all clients can get at it.
>>
>> I've added your info to the known shortcomings section of the wiki so
>> that when it gets re-written for 3.x this issue can be resolved.
>>
>> Amos
>> --
>> Please be using
>> Current Stable Squid 2.7.STABLE6 or 3.0.STABLE13
>> Current Beta Squid 3.1.0.6
>>
>

-- 
Please be using
   Current Stable Squid 2.7.STABLE6 or 3.0.STABLE13
   Current Beta Squid 3.1.0.6