more nginx tracing

main.go

@@ -288,6 +288,10 @@ func nginxLogCapture(logfile, format string) {
 
 		xff, err := logEntry.Field("http_x_forwarded_for")
 		if err != nil && xff != "" {
+			if config.Trace {
+				log.Printf("Using XFF: %s\n", xff)
+			}
+
 			remote = xff
 		}