feat: error format

Author: dbbDylan

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"errors"
 	"flag"
 	"fmt"
 	"log"
@@ -31,7 +32,7 @@ func main() {
 
 	go func() {
 		// service connections
-		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			log.Fatalf("listen: %s", err)
 		}
 	}()