A Challenging Config

[SplitIce]

Ok, Ive been working on a project for a long time. It involves automated
config file building for the nginx web server :)
Now im adding caching. The user of the software can using the interface
select regex's to apply caching logic to.

Ive devided the cache types into 3 types:
1. CACHE: Cache if possible
2. FORCE-CACHE: Cache always, ignore Cache-Control headers
3. NEVER CACHE

all other traffic is caught by the default "/" location. Execution order
for these statements is from 1->3 (e.g 3 should override 1).

I have a couple questions:

1) How can I ignore the effect of cache control on caching?
proxy_hide_header?

2) What is the most efficient order to acheive this caching override
system, my origional idea was to just use location blocks like

location ~ to_cache {
     proxy_cache ....;
     proxy_pass ....;
}

location ~ not_to_cache {
     proxy_cache off;
     proxy_pass ....;
}

location / {
    proxy_pass ....;
}

is this right? Im not really sure I understand the wiki text on matching
order.

Thanks in advance,
SplitIce
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