• 400-499 means the client did something wrong
  • 400: Bad Request - The server can't understand the request
  • 404: Not Found - The requested resource does not exist
  • 418: I'm a teapot - The server refuses the attempt to brew coffee with a teapot.
• 500-599 means there was an error on the server
  • 500: Internal Server Error - Something went wrong
  • 503: The server is not ready to handle the request
  • 504: Another server behind the one you are talking to timed out

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