Application Servers

Stateless App server

• All servers don’t remember client sessions

  • Using server-side cache like Redis

  • Using self contained data coming with the request such as tokens payload, headers, request payload...

Stateful App Server

• Remember user sessions

  • Hash table (or any other cache data structure) to remember which app server to routes to

  • Sticky sessions

  • More difficult to scale

REST APIs

What is REST?: REST API TutorialREST API Tutorial

Web API Design Best Practices - Azure Architecture CenterMicrosoftLearn

RESTful API Designing guidelines — The best practices | HackerNoonhackernoon

REST API Error Handling Best PracticesREST API and Beyond