code: function(target, methodName, methodArgs, probeData, rc) {
          // If no callback has been used then end the metrics after returning from the method instead
          if (aspect.findCallbackArg(methodArgs) === undefined) {
            // Need to get request method and URL again
            var ri = getRequestItems(methodArgs[0]);
            // End metrics (no response available so pass empty object)
            that.metricsProbeEnd(probeData, ri.requestMethod, ri.urlRequested, {}, ri.headers);
            that.requestProbeEnd(probeData, ri.requestMethod, ri.urlRequested, {}, ri.headers);
          }
          return rc;
        }
docs: After 'https.request' function returns