Book Image

Spring 5.0 Microservices - Second Edition

By : Rajesh R V
Book Image

Spring 5.0 Microservices - Second Edition

By: Rajesh R V

Overview of this book

The Spring Framework is an application framework and inversion of the control container for the Java platform. The framework’s core features can be used by any Java application, but there are extensions to build web applications on top of the Java EE platform. This book will help you implement the microservice architecture in Spring Framework, Spring Boot, and Spring Cloud. Written to the latest specifications of Spring that focuses on Reactive Programming, you’ll be able to build modern, internet-scale Java applications in no time. The book starts off with guidelines to implement responsive microservices at scale. Next, you will understand how Spring Boot is used to deploy serverless autonomous services by removing the need to have a heavyweight application server. Later, you’ll learn how to go further by deploying your microservices to Docker and managing them with Mesos. By the end of the book, you will have gained more clarity on the implementation of microservices using Spring Framework and will be able to use them in internet-scale deployments through real-world examples.
Table of Contents (11 chapters)

Enabling cross origin for microservices interactions


Browsers are generally restricted when client-side web applications running from one origin request data from another origin. Enabling cross origin access is generally termed as CORS (Cross Origin Resource Sharing).

This is particularly important when dealing with microservices, such as when the microservices run on separate domains, and the browser tries to access these microservices from one browser after another:

The preceding example showcases how to enable cross origin requests. With microservices, since each service runs with its own origin, it will easily get into the issue of a client-side web application, which consumes data from multiple origins. For instance, a scenario where a browser client accesses customers from the customer microservice, and order history from the order microservices is very common in microservices world.

Spring Boot provides a simple declarative approach for enabling cross origin requests.

The following code...