In this example, the API Gateway audit log contains “Message was not processed: Undefined (-1)”.
There may be some issue with the URL being used to route the request to the backend system. For example, let’s say requests are being routed to http://example.com:12345/sample.
If there is an issue with the URL being used to route the requests to the backend application or service, events will not be written to the application server logs, such as SystemOut.log (WebSphere), catalina.log (Tomcat), or mule_ee.log (Mule), as the API Gateway is not able to establish a connection to the application server.
When Auth Method is HTTP Basic (e.g. basic authentication), the user name being used may not be valid.