[edit] fastcgi_cache_methods

syntax: fastcgi_cache_methods [GET HEAD POST];

default: fastcgi_cache_methods GET HEAD;

context: main, http, location

This directive specifies which HTTP methods are allowed to be used when caching FastCGI requests. Note that GET and HEAD are syntactic sugars, i.e., a mere convenience in terms of this directive configuration logic. They cannot be disabled even if you set:

fastcgi_cache_methods  POST; # note that GET and HEAD are still enabled

Module: HttpFastcgiModule