how to get a value from upstream and redirect to another url according to the value?

[notedit]

hello

i want to write a module , in this module i first get a value from the
memcache upstream , then i will redirect the url according to the value i
got?

i know how to get a value from memcache upstream, but i don't not know where
and when and how i redirect to another url.

thanks for your reading .

-- 
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Best Wishes,
from   刘连响
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