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CORS Explained: Why It's a Browser Problem (and How to Fix It on the Server)

CORS (Cross-Origin Resource Sharing) is responsible for more confused developer Stack Overflow questions than almost any other browser feature.

  • CORS is a browser problem caused by different origins in URLs
  • Simple requests use GET, POST, or HEAD methods with specific content types
  • Preflighted requests involve complex methods, custom headers, or JSON content types

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