[squid-users] Will Squid Proxy work if it is offline

[Amos Jeffries]

On 21/12/17 13:39, Medya wrote:
> I meant in pure academic sense, not for using in real world.  what is 
> the default validation date, let say we own our own network, can we tell 
> it never expire, or expire in 1 year? so we cache all the photos,and all 
> our private network users can just access the same photo without ever 
> going to public internet?

For academic answers I suggest you read through RFC 7234 and 7232.
  <https://tools.ietf.org/html/rfc7234>
  <https://tools.ietf.org/html/rfc7232>


Squid provides the refresh_pattern directive where you can supply custom 
default parameters for the heuristic caching algorithm for responses 
which lack sufficient details. The default squid.conf refresh_pattern 
definition provides parameters for up to 1 week of caching.

refresh_pattern directive also provides some overrides to make those 
heuristics be applied to responses where it SHOULD NOT be used. Be 
conservative using those, the person who designed the site has a lot 
better knowledge of what could or does go wrong. Everything choice of 
theirs you override risks breakage in subtle ways you may not be aware 
of nor able to detect easily.
  eg did you ever consider that "photos" includes Captcha and bioprint 
authentication details?
  or that content in HTTP/1.1 changes based on which Browser clients are 
using?


Amos