The twelve-factor app principles are a collection of best practices for building microservices-based cloud-native applications. These applications are modular, scalable, and agile. They are designed to perform at web scale and provide high resiliency.
The Reactive Manifesto describes how to design and architect Reactive systems according to your needs.Systems built as Reactive Systems are more Reliable, flexible, loosely coupled, scalable and resilient. This makes them easier to develop and amenable to change. Reactive systems are more tolerant of failure and when failure does occur, they meet it with elegance rather than disaster.
REST API’s have a very rich vocabulary to communicate a variety of statuses and results. The verbs put, post, update, get and others are used to indicate the action that must be performed. The status indicate the result of the actions performed by the verbs.