Explain the API gateway pattern.
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Understand the problem
api-gateway
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Read the code
Gateway routing table (concept)
// Match path -> upstream service. Cross-cutting policy applied centrally.
const routes = [
{ prefix: "/auth", upstream: "http://auth-svc:8080" },
{ prefix: "/orders", upstream: "http://orders-svc:8080", auth: true, rateLimit: "100/min" },
{ prefix: "/users", upstream: "http://users-svc:8080", auth: true },
];
// Every request flows through the same pipeline:
// tls -> authenticate -> rateLimit -> route(prefix) -> proxy(upstream)05
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