Grokking Microservices Design Patterns
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API Gateway Pattern: An Example

The last lesson listed what an API gateway does. This lesson builds one, and the code runs.

The system is a library with three services. The catalogue service answers searches and imports. The user service holds profiles and loans. The inventory service tracks copies on the shelf. A client never calls those services. It calls the gateway.

What the Gateway Adds

Routing on its own would make the gateway a thin pass-through. These are the parts that make it worth running.

  1. Routing: match the request path to the service that owns it. 2

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