When are CORS preflight requests sent by the browser?

  • Before making certain types of requests
  • After a successful request
  • Randomly to check server compatibility
  • Only when cookies are involved
CORS preflight requests are sent by the browser before making certain types of requests, specifically those that could have an impact on server security or state. These preflight requests are used to check with the server if the actual request (e.g., a cross-origin POST request with custom headers) is allowed, ensuring server compatibility and security.
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