fix

build-android.bat

@@ -0,0 +1,5 @@
+SET CGO_ENABLED=0
+SET GOOS=linux
+SET GOARCH=arm
+SET GOARM=7
+go build -trimpath -ldflags "-w -s" -tags="androidgodns"

natmap/natmap.go

@@ -60,14 +60,12 @@ func keepalive(ctx context.Context, port uint16, log func(error)) {
 			defer time.Sleep(10 * time.Second)
 
 			rep, err := c.Do(reqs)
-			if rep != nil {
-				defer rep.Body.Close()
-			}
 			if err != nil {
 				c.CloseIdleConnections()
 				log(err)
 				return
 			}
+			defer rep.Body.Close()
 		}()
 	}
 }