• Spring Cloud Gateway
• Spring Boot / WebFlux / Reactor 기반의 Non Blocking API Gateway.
• Zuul 에 대응. Java/Spring 기반 개발자들에게는 Spring Cloud Gateway 가 더 나아 보인다.
  • 이 페이지에 API Gateway 설계에 대한 내용을 많이 정리해뒀음.
  • 결론, 특별한 경우가 아니면 API Gatway 사용하지 말라.
• Java Code 기반 Routing 설정 가능

• localhost:8080/get → http://httpbin.org:80/get 으로 요청 라우팅

  .route(p -> p.path("/get")
    .filters(f -> f.addRequestHeader("Hello", "World"))
    .uri("http://httpbin.org:80"))
   

• URL을 중간에 바꿔치기해서 라우팅 localhost:8080/api/v1/get → http://httpbin.org:80/get 으로 요청 라우팅

  .route(p -> p.path("/api/v1/get")
    .filters(f -> f.setPath("/get"))
    .uri("http://httpbin.org:80"))

• PATH 앞에 떼어내기 localhost:8080/api/httpbin/get → http://httpbin.org:80/get

  route("httpbin", p -> p.path("/api/httpbin/**")
     .filters(f -> f.stripPrefix(2))
   .uri("http://httpbin.org:80))
  // '/api' - 1, '/httpbin' - 2 해서 2 path 건너뛰기

• PATH Variable 정규표현식 localhost:8080/api/httpbin/get/123 → http://httpbin.org:80/get/123, 단 /get/abc 는 거부됨

  route("httpbin", p -> p.path("/api/httpbin/get/{num:[0-9]+}")
     .filters(f -> f.stripPrefix(2))
   .uri("http://httpbin.org:80))

• Path Rewrite : java - Spring Cloud Gateway 2.0 forward path variable - Stack Overflow

  route("userById", t -> t.path("/users/**")
    .filters(rw -> rw.rewritePath("/users/(?<segment>.*)", "/users/${segment}"))
    .uri("http://localhost:8080/users/"))

implementation 'org.springframework.boot:spring-boot-starter-actuator' 의존성 추가

management.endpoint.gateway.enabled=true # default value
management.endpoints.web.exposure.include=gateway

• Getting Started · Building a Gateway
• Spring Cloud Gateway Sample
• Exploring the New Spring Cloud Gateway | Baeldung
• A look into Spring Cloud Gateway!
• Spring Cloud Gateway - Configuring a Simple Route - DZone Microservices
• Spring Cloud Gateway 2.1.0RELEASE 레퍼런스
• Spring Cloud Gateway Routing Predicate Factories | Baeldung
• Spring Cloud Gateway | Popit