API gateways

• thin layer between the micro service and the client, so it routes the request from client based on a constant url to the specific micro service

• handles routing as well as some middleware standard authentication part which was earlier done by all the micro service

• so an api gateway does --

  • validate the request

  • run a middle ware - oauth, rate limiting etc

  • route to the correct service based on the request

  • transform the response

  • transform a request

• ex — kong

• Don't spend too much time on this, this is taken for granted during the microservice part