API Gateway

An API Gateway sits between clients (Mobile, Web) and services. It acts as a reverse proxy, accepting all API calls, aggregating the various services required to fulfill them, and returning the appropriate result.

When to Use

• Microservices: Essential to hide the complexity of backend services (Service Discovery).
• Cross-Cutting Concerns: Centralizing Authentication, SSL Termination, Rate Limiting, and Logging.
• Protocol Translation: Converting HTTP (Client) to gRPC (Internal).

Core Functionality

Routing

GET /users -> User Service GET /orders -> Order Service

Aggregation (BFF - Backend for Frontend)