SpringSecurity: Authenticating & Authorizing AJAX Requests

This is my second post on Spring Security (first being this) and I will try to be more detailed here. Please keep sharing your feedback with me so that I could improve myself.

After all of the lengthy setups, primary value that we get from Spring Security (or any other security framework) is the ability to authenticate and authorize each request that application receives. First I will try to explain a bit the processes of authentication and authorization.
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