[RFC] new Squid status codes

I've kind of been holding off this in hopes that turning the status
codes into a flag structure instead of an enum would make it simpler.
That seems not to be happening anytime soon and we are getting a growing
number of TCP_MISS labelled actions that are not traditional cache MISS.

So here is the set of proposed new codes:

TCP_TUNNEL

  - initially for CONNECT requests which Squid serves Direct. Also to be
used in future if Squid accepts an Upgrade request for protocols like
WebSockets

TCP_RELAY

 - for requests which Squid serves without even considering the stored
content. ie CONNECT relayed to cache_peer, requests forced to be MISS by
"cache deny" or size limits, etc
  The key property being that these can never be a HIT so dont worry
about it when trying to reduce MISS.

TCP_SHARED_*

 - to indicate collapsed forwarding on the request. Similar in principle
to the TCP_CLIENT_* and TCP_REFRESH_* labels indicating client forced
something to happen or revalidation took place.
  Mainly so people can measure the difference between reguler HIT/MISS
and SHARED_HIT/MISS to determine if collapsed forwarding is worth it.

Amos
Received on Sat Mar 08 2014 - 01:26:44 MST