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Design a Layer 7 network proxy handling 500K concurrent connections with sub-millisecond added latency using epoll, connection pooling, and zero-copy I/O.
## Problem
Design a high-performance Layer 7 (HTTP/HTTPS) reverse proxy that can handle 500,000 concurrent connections with less than 1 millisecond of added latency. The proxy sits between clients and a fleet of backend servers, performing TLS termination, load balancing, request routing, and connection pooling.
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