[squid-users] Cache Peer Connection

[Amos Jeffries]

On 21/04/22 00:24, Garbacik, Joe wrote:
> When squid connects to an upstream cache peer, does it create a new
> tcp session between the peers for each request from a client on the
> original squid server or does it maintain the session between the
> peers for a period of time to allow other requests via the
> established session?
> 


FYI; TCP has connections, not sessions. There is a subtle difference but 
very important in that it limits what can be done by other protocols 
using TCP as a transport.


The answer to your questions depend on a lot of things...

Squid supports HTTP persistence and pipeline to both clients and peers 
independently by default. For details on how those work see
  <https://datatracker.ietf.org/doc/html/rfc7230#section-6.3>
  <https://datatracker.ietf.org/doc/html/rfc7230#section-6.3.2>

Specifically, use of the features requires that;
  * the peer also supports them, and
  * your squid.conf has not disabled them, and
  * your squid.conf has not enabled features that require them to be 
disabled, and
  * the traffic has not forbidden them, and
  * the the messages going through allow them.


Amos