MLE-24763 Including server response body in error message

Author: rjrudin

lib/responder.js

@@ -1039,6 +1039,9 @@ function isResponseStatusOkay(response) {
                 ((typeof contentType === 'string' || contentType instanceof String) &&
                     /^application\/([^+]+\+)?json(\s*;.*)?$/.test(contentType)) ?
                 mlutil.parseJSON(bodyMsg) : bodyMsg;
+
+              // Enhance error message with response body details for better debugging
+              clientError.message = clientError.message + ' - Server response: ' + bodyMsg;
             }
             operation.errorListener(clientError);
           }));