I think if I really want to the understand how does the spring or spring MVC work. Such as why and how the HTTP request can reach the controller in the spring MVC. I think the best way to achieve that is debugging the source code in the IDE.
So Where can I download the source code? So can attach the source code to the dependence library in IDE. Let's say the version 4.2.4. Thanks.
You can download it from github -
https://github.com/spring-projects/spring-framework/releases/tag/v4.2.4.RELEASE