beginnerFoundations: What Is Security, and Why Should You Care?
How does Spring Security integrate with the servlet filter chain?
Spring Boot registers a DelegatingFilterProxy in the servlet container, which forwards every request to a Spring-managed bean called FilterChainProxy. FilterChainProxy in turn runs the request through an ordered list of specialized Spring Security filters (CorsFilter, CsrfFilter, UsernamePasswordAuthenticationFilter, ExceptionTranslationFilter, AuthorizationFilter, etc.) before optionally letting it continue on to your controller.
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