What does the error message "Request failed with status code 404" mean for the OpenAI ChatGPT (GPT-3.5) API?

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The error message "Request failed with status code 404" for the OpenAI ChatGPT (GPT-3.5) API means that the requested resource or endpoint was not found on the server. It indicates that the API could not locate the specified URL or the URL does not exist. This error message suggests that the API consumer may have provided an invalid request format, incorrect API endpoint, or mistyped the URL.