API gateways
What an API gateway does and when you need one: a single entry point for many services, routing, authentication, rate limiting, request transformation, aggregation and the backend-for-frontend pattern, observability, gateways versus load balancers and service meshes, popular products, and pitfalls.
CodexBash, , 5 min read
When an application grows from one backend into several services, clients face a problem: which addresses do they call, and does every service need its own authentication, rate limiting, logging and TLS setup? An API gateway solves this by sitting in front of all the services as a single entry point. Clients talk only to the gateway; it handles the common, cross-cutting concerns and routes each request to the right service. This article explains what gateways do, the patterns built on them, and when they help or hurt.
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