Demonstration of Spring Cloud Gateway with .NET Core

This is a simple demonstration of using Spring Cloud Gateway to proxy requests to a rest API implemented in .NET Core.

Prerequisites

• Java
• Maven
• .NET Core 3.0 SDK
• curl (brew install curl)
• jq (brew install jq)

Running

• Run the .NET Core application
  • In a terminal, navigate to the webapi folder
  • dotnet watch run
• Run Spring Cloud Gateway
  • In another terminal window, navigate to the gateway folder
  • mvn spring-boot:run

Tests

• Use Spring Cloud Gateway's Actuator API to view all available routes
  • curl -s http://localhost:8080/actuator/gateway/routes | jq '.'
• Demonstrate using SCG to proxy calls to httpbin.org
  • curl -sv http://localhost:8080/hello
• Use SCG to proxy requests to .NET Core
  • Verify the .NET Core API by calling it directly at /weatherforecast
    • curl -s http://localhost:5000/weatherforecast | jq '.'
    • Response should contain randomly generated weather data
  • Call SCG's /forecast endpoint
    • curl -s http://localhost:8080/forecast | jq '.'
    • Response should contain randomly generated weather data, just like calling .NET Core API directly
  • Compare the HTTP headers for the two requests
    • curl -sv http://localhost:5000/weatherforecast
    • curl -sv http://localhost:8080/forecast
      • The SCG request will contain an "X-Debug: Hello from Spring Cloud Gateway" header
• Demonstrate using SCG to perform weighted routing
  • Execute curl -s http://localhost:8080/weighted | jq '.' several times
  • Note that the response is a JSON object where "weighted-route" is "1" and other times it is "2"
  • Calls made to http://localhost:8080/weighted are sometimes forwarded by SCG to http://echo.jsontest.com/weighted-route/1 and other times to http://echo.jsontest.com/weighted-route/2