API Gateway is an architectural pattern to create a façade that exposes the internal system’s data to external clients in a decoupled layer, reducing the dependency between frontend and backend components. Nowadays, that pattern is widely spread in the computing field being used in business applications and integration solutions for small, medium, and large enterprises. The value of breaking the dependency between clients and backend implementations is very substantial. Many paramount functions of modern distributed systems can be implemented in the API gateway. The list of functions is quite large and will be elucidated in the next sections of this article.

Currently, we see API gateways usage in critical mission applications and use cases such as microservices architecture, legacy monoliths, monolith migration to microservices projects, and integration layers. Additionally, the API gateways are involved in different deployment models, since the bare-metal servers running on-premises, virtual machines like Amazon EC2, and containerized solutions such as Kubernetes on Amazon EKS, even in the modern serverless computing platform, covering all possible deployment spectrum available today. The issues solved using the API Gateway pattern are explored in section 2.

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