What does the occurrence of an unexpected LAMBDA_RUNTIME failure and an Http response code of 413 error indicate in the posting of a handler success response?

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The occurrence of an unexpected LAMBDA_RUNTIME failure and an Http response code of 413 error in the posting of a handler success response indicates that the Lambda function encountered an internal error due to exceeding the maximum limit of the request size in the API Gateway. The Lambda function may have received a request that exceeded the maximum payload size allowed, causing the function to fail and return an HTTP 413 status code. This error can be resolved by splitting the request into smaller chunks or increasing the maximum payload size allowed in the API Gateway configuration.