apigateway

Spring cloud APi Gateway previously popular gate is Zuul api gateway but now it is not supported now spring cloud api gateway

Steps to create Spring Cloud API Gateway

Step 1

On Spring Initializr, choose:  
  
Group Id: com.microservices.apigateway  
Artifact Id: api-gateway  
Dependencies  
DevTools  
Actuator  
Config Client  
Eureka Discovery Client  
Gateway (Spring Cloud Routing)  

- ***Step 2***:
pom.xml dependency

org.springframework.cloud spring-cloud-starter-gateway ```

Step 3: /api-gateway/src/main/resources/application.properties Modified

spring.application.name=api-gateway
server.port=8765

eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka

Step 4 Run http://localhost:8765/CURRENCY-EXCHANGE/currency-exchange/from/USD/to/INR

It gives error

Step 5 In api gateway

application.properties
spring.cloud.gateway.discovery.locator.enabled=true

Step 6 : try again

http://localhost:8765/CURRENCY-EXCHANGE/currency-exchange/from/USD/to/INR

its works!

Step 7: but Url is not look like good

application.properties

spring.cloud.gateway.discovery.locator.lower-case-service-id=true

Step 8
now hit url: http://localhost:8765/currency-exchange/currency-exchange/from/USD/to/INR
Step 9: Exploring Routes with Spring Cloud Gateway

Final URL we want

http://localhost:8765/currency-exchange/from/USD/to/INR
http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10
http://localhost:8765/currency-conversion-feign/from/USD/to/INR/quantity/10
http://localhost:8765/currency-conversion-new/from/USD/to/INR/quantity/10

Step 9

/api-gateway/src/main/resources/application.properties Modified
Commented

#spring.cloud.gateway.discovery.locator.enabled=true  
#spring.cloud.gateway.discovery.locator.lowerCaseServiceId=true

Step 10
Create new configuration file

ApiGatewayConfiguration.java  
  
import org.springframework.cloud.gateway.route.RouteLocator;  
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;  
import org.springframework.context.annotation.Bean;  
import org.springframework.context.annotation.Configuration;  
  
@Configuration  
public class ApiGatewayConfiguration {  
	  
	@Bean  
	public RouteLocator gatewayRouter(RouteLocatorBuilder builder) {  
		return builder.routes()  
				.route(p -> p  
						.path("/get")  
						.filters(f -> f  
								.addRequestHeader("MyHeader", "MyURI")  
								.addRequestParameter("Param", "MyValue"))  
						.uri("http://httpbin.org:80"))  
				.route(p -> p.path("/currency-exchange/**")  
						.uri("lb://currency-exchange"))  
				.route(p -> p.path("/currency-conversion/**")  
						.uri("lb://currency-conversion"))  
				.route(p -> p.path("/currency-conversion-feign/**")  
						.uri("lb://currency-conversion"))  
				.route(p -> p.path("/currency-conversion-new/**")  
						.filters(f -> f.rewritePath(  
								"/currency-conversion-new/(?<segment>.*)",   
								"/currency-conversion-feign/${segment}"))  
						.uri("lb://currency-conversion"))  
				.build();  
	}  
  
}  
  
  
Run the application and hit  
  
http://localhost:8765/currency-exchange/from/USD/to/INR  
http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10  
http://localhost:8765/currency-conversion-feign/from/USD/to/INR/quantity/10  
http://localhost:8765/currency-conversion-new/from/USD/to/INR/quantity/10

chirag1210/apigateway

apigateway