Sample code to illustrate spring spring-cloud gateway framework

The idea is to utilize only open-source frameworks, tools and applications to test the validity of spring-security as a proxy to different URL's

Requirement

• Java 11
• Docker

Installation

• First clone the project using git
• Validate you have java jdk11

java --version

output

java 11.0.4 2019-07-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.4+10-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.4+10-LTS, mixed mode)

• Build docker images

  • Api-Gateway

    cd api-gateway
    gradlew clean build jibDockerBuild
    cd ..

• Start docker-compose and all applications

    docker-compose up -d

Validate Applications is up

Test the Application

The following are the 4 endpoints I tested:

http://localhost:8280/test

response:

404 - Not Found

logs show:

2019-12-12 20:26:27.013 TRACE 44696 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [2c107ac2] HTTP GET "/test", headers={masked}
2019-12-12 20:26:27.013  INFO 44696 --- [ctor-http-nio-2] c.e.l.server.filter.LoggingWebFilter     : *** Request /test called ***
2019-12-12 20:26:27.178 TRACE 44696 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [2c107ac2] Completed 404 NOT_FOUND, headers={masked}
2019-12-12 20:26:27.178 TRACE 44696 --- [ctor-http-nio-2] org.springframework.web.HttpLogging      : [2c107ac2] Handling completed

http://localhost:8280/foo/

response:

404 - Not Found

logs show:

2019-12-12 20:29:23.631 TRACE 44696 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [2c107ac2] HTTP GET "/foo/", headers={masked}
2019-12-12 20:29:23.632  INFO 44696 --- [ctor-http-nio-2] c.e.l.server.filter.LoggingWebFilter     : *** Request /foo/ called ***
2019-12-12 20:29:23.710 TRACE 44696 --- [ctor-http-nio-2] o.s.w.s.adapter.HttpWebHandlerAdapter    : [2c107ac2] Completed 404 NOT_FOUND, headers={masked}
2019-12-12 20:29:23.711 TRACE 44696 --- [ctor-http-nio-2] org.springframework.web.HttpLogging      : [2c107ac2] Handling completed

http://localhost:8280/foo

Whitelabel Error Page
This application has no configured error view, so you are seeing this as a fallback.

Thu Dec 12 20:30:48 CST 2019
[2c107ac2] There was an unexpected error (type=Internal Server Error, status=500).
The path does not have a leading slash.
java.lang.IllegalArgumentException: The path does not have a leading slash.
	at org.springframework.util.Assert.isTrue(Assert.java:118)
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
	|_ checkpoint ⇢ com.example.library.server.filter.LoggingWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ HTTP GET "/foo" [ExceptionHandlingWebHandler]
Stack trace:

http://localhost:8280/actuator/

response:

{"_links":{"self":{"href":"http://localhost:8280/actuator","templated":false},"gateway":{"href":"http://localhost:8280/actuator/gateway","templated":false}}}

going to http://localhost:8280/actuator/gateway

response:

Whitelabel Error Page
This application has no configured error view, so you are seeing this as a fallback.

Thu Dec 12 20:25:51 CST 2019
[2c107ac2] There was an unexpected error (type=Not Found, status=404).
org.springframework.web.server.ResponseStatusException: 404 NOT_FOUND
	at org.springframework.web.reactive.resource.ResourceWebHandler.lambda$handle$0(ResourceWebHandler.java:325)
	Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
	|_ checkpoint ⇢ com.example.library.server.filter.LoggingWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
	|_ checkpoint ⇢ HTTP GET "/actuator/gateway" [ExceptionHandlingWebHandler]