upcache
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rate-limit by default (to a high limit anyway) and queue requests to same key
First it protects upstream in case of several kinds of ddos, and second it improves performance in case of simultaneous requests.
Idea for implementation in https://github.com/openresty/srcache-nginx-module/issues/53
See also https://medium.com/@sportebois/nginx-rate-limiting-in-a-nutshell-128fe9e0126c#.ilkvq4rh5