https://code.facebook.com/posts/1503205539947302/introducing-proxygen-facebook-s-c-http-framework/
Proxygen is not designed to replace Apache or nginx — those projects focus on building extremely flexible HTTP servers written in C that offer good performance but almost overwhelming amounts of configurability. Instead, we focused on building a high performance C++ HTTP framework with sensible defaults that includes both server and client code and that's easy to integrate into existing applications.
하나마나 4번이 젤 빠를텐데 C++이라는 것이 부담..