Depending on the configuration, each layer can help to create authentication, including basic authentication, digest authentication, form authentication, or any custom authentication that we choose to implement ourselves. The first step is done in a multi-layer Security Filter. Spring Security includes 2 basic steps: creating an authentication object for each request, and applying the check depending on the configured authentication. Spring Security OAuth 2 is an implementation of OAuth 2 that is built on top of Spring Security, which is a very extensible authentication framework. We focus on OAuth 2 and JWT because they are the most popular authentication framework and protocol in the market. In general, you may want to adopt OAuth if you need to allow other people to build a front end app for your services. We will not go to detail on when you want to use OAuth 2 and JWT. However, we will focus on understanding the principle of the OAuth 2 request. This sample was developed partly based on the official sample of Spring Security OAuth 2. In this example, we will use JSON Web Token (JWT) as the format of the Oauth2 token. Today, let's explore another popular use case of setting up OAuth 2 authentication for a Spring Boot application. Some time ago, we published one article sharing a custom approach to implementing a stateless session in a cloud environment.
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