refactor: use a blank identifier.

Author: php-coder

main.go

@@ -6,7 +6,7 @@ import "net/http"
 func main() {
 	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
 
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+	http.HandleFunc("/", func(w http.ResponseWriter, _ *http.Request) {
 		w.Write([]byte("ok"))
 	})