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What hides inside “the client sends a request”: the TCP/IP layers, IPs and subnets, TCP's handshake, flow control and head-of-line blocking, port exhaustion, UDP, HTTP/1.1 to HTTP/3, WebSocket and SSE, TLS, latency's four parts, and NAT.
Last time, you sized a system on a napkin, and learned that a round trip to another continent costs about 150 milliseconds.