intermediate~2h
CORS: Cross-Origin Resource Sharing
A frontend on one origin calling a backend on another is normal in modern architectures, and browsers block it by default. This chapter is what "origin" actually means and how to correctly unblock it.
Learning objectives
- Beginner: State what makes two URLs the 'same origin' versus different origins.
- Intermediate: Configure Spring Security's CORS support so a specific frontend origin can call the API.
- Advanced: Explain why combining a wildcard origin with credentials is a dangerous anti-pattern, and what to do instead.
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CORS: Cross-Origin Resource Sharing