Reverse Proxy Advanced Topics
[ 106 ]Directive Explanation
proxy_cache_path A directory in which to place the cached
responses and a shared memory zone
(keys_zone=name:size) to store active
keys and response metadata. Optional
parameters are:- levels: Colon-separated length of
subdirectory name at each level (1 or
2), maximum of three levels deep - inactive: The maximum length of
time an inactive response stays in the
cache before being ejected - max_size: The maximum size of
the cache; when the size exceeds
this value, a cache manager process
removes the least recently used items - loader_files: The maximum
number of cached files whose
metadata are loaded per iteration of
the cache loader process - loader_sleep: The number of
milliseconds paused between each
iteration of the cache loader process - loader_threshold: The maximum
length of time a cache loader iteration
may take
proxy_cache_use_stale The cases under which it is acceptable to
serve stale cached data when an error occurs
while accessing the upstream server. The
updating parameter indicates the case
when fresh data are being loaded.
proxy_cache_valid Indicates the length of time for which a
cached response with response code 200,
301, or 302 is valid. If an optional response
code is given before the time parameter,
that time is only for that response code. The
special parameter any indicates that any
response code should be cached for that
length of time.