Routing and Filtering with Spring Cloud Gateway

Introduction

Spring Cloud Gateway provides a simple, yet effective way to route to APIs and provides cross-cutting concerns such as security and monitoring.

Architecture of Spring Cloud Gateway

The gateway routes incoming requests to appropriate microservices based on predicates and filters.

Spring Cloud Gateway Architecture

Source: Knoldus Blogs

Setting Up Routes

Routes can be configured using Java DSL or YAML. Here's an example using YAML:

yamlCopy
spring:
  cloud:
    gateway:
      routes:
        - id: product-service
          uri: lb://PRODUCT-SERVICE
          predicates:
            - Path=/products/**
          filters:
            - AddRequestHeader=Product-Request, true

In this configuration:

• Requests to /products/** are routed to the PRODUCT-SERVICE.
• A custom header Product-Request is added to the request.

Conclusion

Spring Cloud Gateway offers a flexible way to handle routing and filtering in a microservices architecture, allowing for dynamic and programmable routing rules.