1.
Define a stateless service and provide an example of a stateless interaction in a web application context.
2.
Define a stateful service and provide an example of a stateful interaction in a web application context.
3.
Explain the crucial role of designing stateless services for achieving horizontal scalability and resilience in a backend deployed behind a load balancer. Discuss the implications for load balancing, failure recovery, and adding/removing service instances.
4.
Describe common strategies and technologies for storing state (such as user sessions, shopping cart data, etc.) when the services themselves are designed to be stateless. Provide specific examples of databases or services that fulfill this role.