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Lessons (6)

• How a Web Request Works

  Follow one click from the browser to the server and back, through DNS, TCP, TLS, HTTP, load balancers …

• Proxies, APIs and Real-Time Protocols

  Pick REST, RPC, queues, long polling, WebSockets, TCP or UDP based on the interaction shape. ![Communication choices: reverse …

• Networking, DNS and Traffic Routing

  … application protocols run over transport (TCP/UDP), then network routing (IP), then links/physical delivery. A hostname becomes …

• Backend Languages: Node.js, Go, Python & Rust

  … id}", get(get user)); let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap(); axum …

• Behavioral Patterns I: Observer, Strategy, Command, State

  … deliver delivered -- [ ] cancelled -- [ ] You've used it: useReducer in React, XState state machines, TCP connection states, order and …

• Services & Ingress

  … more features (header matching, traffic splitting for canaries, TCP/gRPC routes) in a standard way. yaml apiVersion: gateway …