The Mystery of the 403 Login: Understanding Spring Security's Two-Stage Authentication
· 11 min read
"My login endpoint is returning 403 Forbidden! But I configured it as .permitAll() in SecurityConfig! Why is the JwtFilter still blocking it?" I spent 2 hours debugging this. Turns out, I had a fundamental misunderstanding of how Spring Security works. The JwtFilter doesn't "skip" endpoints - it runs on EVERYTHING. Let me explain the magic. 🎩✨