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Abstract

The Idea is to have multiple apps running behind the API-Gateway and implement

  1. security concerns (SSO)

in the api-gateway itself.

So, let suppose we have the following three UI apps:

  1. RED (Angular) (URL: red.mra.io)
  2. BLUE (thymeleaf) (URL: blue.mra.io)
  3. GREEN (Angular) (URL: green.mra.io)

and following microservice

  1. user-service

The concept is that: If we login from RED app and then go to the BLUE or GREEN app then it will show the same user information and vice versa.

Dev

Requirements
  1. Java 22
  2. Node 22
Update /etc/hosts file

Add following at the bottom of /etc/hosts

127.0.0.1 red.mra.io
127.0.0.1 blue.mra.io
127.0.0.1 green.mra.io
Run api-gateway
  1. cd api-gateway
  2. ./mvnw spring-boot:run
Run blue-app
  1. cd blue-app
  2. ./mvnw spring-boot:run
Run green-app
  1. cd green-app
  2. npm start
Run red-app
  1. cd red-app
  2. npm start

You can access red-app, blue-app and green-app. Credentials (username: admin, password: Password@1)