[squid-users] Sticky sessions support in squid

[Amos Jeffries]

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On 30/10/2014 1:40 a.m., sai raghavendra wrote:
> Hi,
> 
> We are currently using squid-3.1.10 as an internal proxy server. It
> sends requests to 3 external proxies which interact with the world
> wide web.
> 
> 
> I was just wondering if there is a support for sticky sessions in
> squid , so that we can send a set of continual requests to a
> specific external proxy through squid.

It sounds like you are wanting either the carp, userhash, or
sourcehash peering algorithm.
http://www.squid-cache.org/Doc/config/cache_peer/

> 
> As a part of this, also wanted to know  if the client can send an
> HTTP request header to squid to choose which external proxy squid
> should send the request to.

cache_peer_access with an req_header ACL test can do that.
http://www.squid-cache.org/Doc/config/cache_peer_access/
http://www.squid-cache.org/Doc/config/acl/

However be aware that placing the client UA in control of low-level
routing details is not compatible with the earlier mentioned selection
algorithms. Layering algorithms just causes 500 or 503 errors whenever
the hash algorithm and client disagree on what peer to use.

Amos

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