API Gateway Pattern : Gateway Aggregation

Problem

• Perform a task and need to make multiple calls to various backend services. An application could rely on many services.

• Client may use networks with significant latency, such as cellular networks.

Solution

• Use a gateway to reduce chatiness between the client and the services.

• Can aggregate multiple client requests (usually HTTP requests) targeting multiple internal microservices into a single client request.

Open

API gateways - Azure Architecture Center | Microsoft Learn

API Gateway Aggregation in Practice

Open

• API Gateway products usually act like a reverse proxy for ingress communication, where you can also filter the APIs from the internal microservices plus apply authorization to the published APIs in this single tier.

• It might have a single API Gateway is not so risky because these kinds of API Gateways are "thinner", meaning that you don't implement custom C# code that could evolve towards a monolithic component.