AWS Certified Developer Associate DVA-C02 Practice Question

A 502 Bad Gateway error indicates that the server, while acting as a gateway or proxy, received an invalid response from the upstream server. In this scenario, API Gateway is the proxy, and the Lambda function is the upstream server. A misconfigured integration, such as incorrect permissions or if the function doesn't exist, prevents API Gateway from getting a valid response, resulting in a 502 error. A 404 Not Found error would typically mean the API Gateway endpoint itself could not be found, not that the backend integration failed. A 400 Bad Request would indicate a client-side error, like a malformed request. A 500 Internal Server Error is a generic server error, but 502 is more specific to gateway or proxy problems.