basic module questions

Shaun savage savages at
Sun Sep 25 11:40:52 UTC 2011

I am starting to learn how to write nginx module.  I have a few basic
questions, these are more reference questions.

1> how do you set/create request variable?
2> how do you read a request variable?
3> can an authorization and a filter be in the same module
4> memcached checks at what phase?  I fails does it check again after
the cache is loaded.
5> srcache first checks cache then does a subrequest?  can it do this?

        check cache     -> no -> load cache, retry 

        check cache for more information -> no -> ERROR

        check $url or $request_filename with information from cache ->

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