Book Image

Hands-On Spring Security 5 for Reactive Applications

By : Tomcy John
Book Image

Hands-On Spring Security 5 for Reactive Applications

By: Tomcy John

Overview of this book

Spring Security enables developers to seamlessly integrate authorization, authentication, and a range of security features for complex enterprise applications. This book provides a hands-on approach to developing reactive applications using Spring and will help you get up and running in no time. Complete with step-by-step explanations, practical examples, and self-assessment questions, the book begins by explaining the essential concepts of reactive programming, Spring Framework, and Spring Security. You’ll then learn about a variety of authentication mechanisms and how to integrate them easily with a Spring MVC application. You’ll also understand how to achieve authorization in a Spring WebFlux application using Spring Security. Furthermore, the book will take you through the configuration required to implement OAuth2 for securing REST APIs, and guide you in integrating security in microservices and serverless applications. Finally, you’ll be able to augment add-ons that will enhance any Spring Security module. By the end of the book, you’ll be equipped to integrate Spring Security into your Java enterprise applications proficiently.
Table of Contents (15 chapters)
Title Page
Copyright and Credits
Packt Upsell

CORS Support

Cross-Origin Resource Sharing (CORS) ( is a mechanism that uses additional HTTP headers to tell a browser to let a web application running at one origin (domain) have permission to access selected resources from a server at a different origin. A web application makes a cross-origin HTTP request when it requests a resource that has a different origin (domain, protocol, and port) than its own origin.

We won't be creating full-fledged projects in this section to explain the working of CORS. We will use code snippets and will explain each bit of code so that the section is concise.

Change your Spring Security configuration, as shown in the following code snippet:

public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {

 protected void configure(HttpSecurity http) throws Exception {
 CorsConfigurationSource corsConfigurationSource() {