The Apache WEB server will close a connection after it sends a 4xx or 5xx error.
The netconfd-pro server sits behind Apache and has no control over this behavior.
For example, if an "invalid-value" error is returned because the client is
trying to set a configuration leaf to the wrong value, a "400 Bad Request: will be returned.
Apache will also send a "Connection: close" header and it will terminate the HTTP 1.1 session