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
yes

check cache for more information -> no -> ERROR
yes

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


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