On 11/10/24 11:08, Bryan Seitz wrote:
I removed the header mods and changed the refresh pattern to:
refresh_pattern . 15 20% 1800 override-expire
ignore-no-cache ignore-no-store ignore-private
And I always get TCP_MISS. Any other thoughts?
Ah, I believe it would be best to get a baseline of what Squid default
behaviour is like in your environment. So we can identify what/how you
need to improve it.
Firstly, FYI; this is what those controls **actually** do in current
Squid ..
* override-expires ... forces Squid to handle all responses to act as
if they received "Cache-Control: max-age=900" (15 min) ... store, but
revalidate 180+ seconds (20% of 15min) later.
Result: Anything that could cache longer than 15min becomes a
REFRESH_MISS or MISS, instead of HIT.
Squid default: **do** cache. Revalidate
* after("Date"+"CC: max-age=N") timestamp, otherwise
* after "Expires" timestamp, otherwise
* after ("Date" +1800 minutes) timestamp.
* ignore-no-cache ... the standardized "CC: no-cache" is badly named,
it tells Squid what **can** be cached.
Result: Squid will discard many stored objects and perform a MISS
instead.
Squid default: **do** cache "CC:private" responses, revalidate on
HIT. Log as REFRESH.
* ignore-no-store ... force everything marked "CC: no-store" to be stored.
Result: cache fills with non-reusable objects. Leaving not much room
for actual HIT objects.
Squid default: store only objects with can result in more HITs.
* ignore-private ... force everything with "CC: private" to be discarded.
Result: same as "ignore-no-store".
Squid default: **do** cache "CC:private" responses, revalidate on HIT.
Note that both HIT and REFRESH mean the object **was** cached.
You said that the access.log now contains MISS. Would that be just
"MISS" or "REFRESH" + "MISS" (actually a HIT, but a new object was given
by the server and replaced the pre-stored object).
Can you show a pair of request headers from the client, with matching
response from the server? You can use "debug_options 11,2" in recent
Squid versions to get a cache.log trace of the HTTP transactions.
That might help us spot something more specific. The config change makes
the earlier given ones obsolete.
HTH
Amos
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