Book Image

Building Microservices with Spring

By : Dinesh Rajput, Rajesh R V
Book Image

Building Microservices with Spring

By: Dinesh Rajput, Rajesh R V

Overview of this book

Getting Started with Spring Microservices begins with an overview of the Spring Framework 5.0, its design patterns, and its guidelines that enable you to implement responsive microservices at scale. You will learn how to use GoF patterns in application design. You will understand the dependency injection pattern, which is the main principle behind the decoupling process of the Spring Framework and makes it easier to manage your code. Then, you will learn how to use proxy patterns in aspect-oriented programming and remoting. Moving on, you will understand the JDBC template patterns and their use in abstracting database access. After understanding the basics, you will move on to more advanced topics, such as reactive streams and concurrency. Written to the latest specifications of Spring that focuses on Reactive Programming, the Learning Path teaches you how to build modern, internet-scale Java applications in no time. Next, you will understand how Spring Boot is used to deploying serverless autonomous services by removing the need to have a heavyweight application server. You’ll also explore ways to deploy your microservices to Docker and managing them with Mesos. By the end of this Learning Path, you will have the clarity and confidence for implementing microservices using Spring Framework. This Learning Path includes content from the following Packt products: • Spring 5 Microservices by Rajesh R V • Spring 5 Design Patterns by Dinesh Rajput
Table of Contents (22 chapters)
Title Page
About Packt

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...