Application demonstrating approach for implementing REST client with desired NFRs

Reference implementation of my article demonstrating how to implement REST client using Spring Rest Template and Apache HTTP Client which is :

Optimized in terms of connection pool management along with its externalized configurability
Resilient to handle errors along with configurable retries
Easy to monitor Connection Pool as a resource by capturing required connection pool metrics
Having capability to conditionally access secured REST endpoints

Bootstrapping downstream system a.k.a 'alias-service-api' which is invoked by Spring Rest Template