hello ,everyone I have some path to nginx proxy cache subsystem

[我不爱吃馄饨面]

i have a requirement of the proxy cache
it's about the path stored in disk
because i must do the purge aobut the url path, like that.

http://hostname/a/b/c

if some chage happened in b,all the subdir of b in cache must be delete.
and i change the cache filepath save pattern.

in the past save like
/path/to/cahce/*/****** (* is the hexdump of key md5)
and now
/path/to/cache/a/b/c/*/*****

for purge b  ,you can rm all the subdir of b. And the request is bypass for
the new cache.

DO this patch is useful for nginx?
AND is there some testcases for it,or is some patch standard for nginx ,so
I can submit it?
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