If you’re building a microservice-backed application, a key benefit is separating the concerns of your application across individual microservices, each with its own ability to scale and encapsulate different functionality. The frontend—ostensibly a single-page application running in your user’s browser—will need access to the microservices that make up your web application. Each service could be directly accessible to the public web, but that adds security concerns.

An API gateway, however, allows for a centralized layer to handle concerns like authentication, traffic monitoring, or request and response transformations. API gateways are also a great way to leverage rate limiting and caching to improve the resilience and performance of your application. 

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