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The Internet Questions

Can you tell me what CORS are?

  • HTTP header based mechanism
  • allows a server to indicate any other origin (domain, scheme, port) than its own which a browser should permit loading of recourses
  • browser can make a "preflight" request to a server hosting the cross-origin resource, in order to check that the server permit an actual request
  • browser sends headers that indicate HTTP method and header will be used in the actual request

Can you give me an example for a cross-origin request?

https://domain-a.com uses XMLHttpRequest to make a request for https://domain-b.com/data.json.