What does it mean when I receive an undefined response while calling an API?

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When you receive an "undefined" response while calling an API, it means that the API did not return any data or response. It could be due to several reasons such as incorrect API endpoint, incorrect parameters or headers passed with the request, server error, or connectivity issues. It is important to debug and investigate the issue by checking the API documentation, API logs, and network logs to identify the root cause and fix the issue.