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Details in Gateway Aggregation pattern - Azure Architecture Center | Microsoft Learn |
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.
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API Gateway Aggregation in Practice
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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.