modify

HttpServer/Http/Response.php

@@ -144,13 +144,11 @@ class Response extends HttpService
      */
     public function getResponseFormat(): string
     {
-        if ($this->format == self::HTML) {
+        return match ($this->format) {
-            return 'text/html;charset=utf-8';
+            Response::HTML => 'text/html;charset=utf-8',
-        } else if ($this->format == self::XML) {
+            Response::XML => 'application/xml;charset=utf-8',
-            return 'application/xml;charset=utf-8';
+            default => 'application/json;charset=utf-8',
-        } else {
+        };
-            return 'application/json;charset=utf-8';
-        }
     }