Caching - What do these two nginx settings mean?

Question

proxy_cache_min_uses 3;
proxy_cache_bypass $cookie_nocache $arg_nocache;

Answer 1

proxy_cache_min_uses 3; #The results will be cached after 3 queries
proxy_cache_bypass $cookie_nocache $arg_nocache;

When the two variables cookie_nocache and arg_nocache are not empty, the request result will not be taken out from the cache

Answer 2

http://nginx.org/cn/docs/http/ngx_http_proxy_module.html