Spring Cloud Gateway— An Introduction

In this article, we will try to understand the fundamentals of Spring Cloud Gateway which represents one of the most important patterns in the Microservices Architecture — API Gateway. We will create sample implementations based on Spring Boot & Spring Cloud Gateway. This is the fifth part of our Spring Boot Microservices series.

Lal Verma
9 min readSep 15, 2020
Photo by Zetong Li on Unsplash

API Gateway

Spring Cloud Gateway provides a library to build an API Gateway. This is the preferred gateway implementation provided by Spring Cloud. It's built with Spring 5, Spring Boot 2, and Project Reactor.

To understand the offerings of Spring Cloud Gateway we must understand the API Gateway pattern in detail. Let's assume, we are implementing the microservices architecture for our e-commerce system. One of the microservices in the system is Product Catalog Service, which is responsible to manage product lifecycle through — create, update, delete, and get operations. Let’s go through some common scenarios, we might come across —

Scenario 1 — Multiple Versions of Service

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