MAPG-180 don't buffer content output to variable

src/Response/JsonContent.php

@@ -7,13 +7,11 @@ class JsonContent extends ContentBase
         $this->data = &$data;
     }
 
-    public function &render(): string
+    public function render(): void
     {
         $this->data['__debug__runtime'] = round((hrtime(true) - SCRIPT_STARTED) / 1e+6, 1);
 
-        $content = json_encode($this->data);
-
-        return $content;
+        echo json_encode($this->data);
     }
 
     public function getContentType(): string