Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By : Raja CSP Raman, Ludovic Dewailly
Book Image

Building RESTful Web Services with Spring 5 - Second Edition

By: Raja CSP Raman, Ludovic Dewailly

Overview of this book

REST is an architectural style that tackles the challenges of building scalable web services. In today's connected world, APIs have taken a central role on the web. APIs provide the fabric through which systems interact, and REST has become synonymous with APIs.The depth, breadth, and ease of use of Spring makes it one of the most attractive frameworks in the Java ecosystem. Marrying the two technologies is therefore a very natural choice.This book takes you through the design of RESTful web services and leverages the Spring Framework to implement these services. Starting from the basics of the philosophy behind REST, you'll go through the steps of designing and implementing an enterprise-grade RESTful web service. Taking a practical approach, each chapter provides code samples that you can apply to your own circumstances.This second edition brings forth the power of the latest Spring 5.0 release, working with MVC built-in as well as the front end framework. It then goes beyond the use of Spring to explores approaches to tackle resilience, security, and scalability concerns. Improve performance of your applications with the new HTTP 2.0 standards. You'll learn techniques to deal with security in Spring and discover how to implement unit and integration test strategies.Finally, the book ends by walking you through building a Java client for your RESTful web service, along with some scaling techniques using the new Spring Reactive libraries.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Spring Security and JWT (JSON Web Token)

Load balancing

A load balancer is the most useful tool in clustering. A load balancer uses a variety of algorithms, such as round-robin, least connection, and so on, to forward the incoming request to the right backend servers for processing.

There are a lot of third-party load balancers available on the market, such as F5 (, HAProxy (, and so on. Though these load balancing tools behave differently, they focus on the main role: distributing the request load to the available backend server and maintaining the balance between all the servers. By proper load balancing, we prevent a single backend server from being overloaded. Also, most load balancers come with health monitoring, such as checks to verify the availability of servicing servers.

Besides the main request distribution among servers, load balancers keep the backend servers protected from frontend servers. Frontend servers will have no idea about which backend server to sent the request to as load...