Response Codes Continued
- 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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