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What is composition in API gateway?
An API gateway often does API Composition, which enables a client such as mobile device to efficiently retrieve data using a single API request. The API gateway might provide a RESTful API to external clients even though the application services use a mixture of protocols internally include REST and gRPC.
What is a gateway pattern?
A gateway encapsulates the semantic gap between the object-oriented domain layer and the relation-oriented persistence layer. More specifically, it encapsulates and centralizes the application’s SQL: More generally, a gateway can be anything that hides access to a remote server or a complex library.
Why we use API gateway?
An API gateway is a way to decouple the client interface from your backend implementation. When a client makes a request, the API gateway breaks it into multiple requests, routes them to the right places, produces a response, and keeps track of everything.
Where is API gateway used?
Most enterprise APIs are deployed via API gateways. It’s common for API gateways to handle common tasks that are used across a system of API services, such as user authentication, rate limiting, and statistics.
What is API gateway for?
An API gateway is an API management tool that sits between a client and a collection of backend services. An API gateway acts as a reverse proxy to accept all application programming interface (API) calls, aggregate the various services required to fulfill them, and return the appropriate result.
How is the facade pattern similar to the API gateway pattern?
This pattern is a service that provides a single-entry point for certain groups of microservices. It’s similar to the Facade pattern from object-oriented design, but in this case, it’s part of a distributed system.
How are client apps coupled without API gateway pattern?
Coupling: Without the API Gateway pattern, the client apps are coupled to the internal microservices. The client apps need to know how the multiple areas of the application are decomposed in microservices.
What are the different types of API gateways?
It defines a separate API gateway for each kind of client. In this example, there are three kinds of clients: web application, mobile application, and external 3rd party application. There are three different API gateways. Each one is provides an API for its client. A simple Java/Spring API gateway from the Money Transfer example application.
How are microservices used in the API gateway pattern?
The Microservice architecture pattern creates the need for this pattern. The API gateway must use either the Client-side Discovery pattern or Server-side Discovery pattern to route requests to available service instances.