title: What is a Resource Server when it comes to Microservices?
body: <p>I am very confused about what is Resource Server in oAuth . </p>
  
  <p>Is Resource Server something like API Gateway? or is Resource Server a business type of Microservice like for example "search microservice", "shopping cart microservice"? </p>
  
  <p>If I have Authorization Server, API Gateway, and 15 business type Microservices behind the API gateway, does it mean I have 15 Resource Servers? </p>