fixed content length bug

Author: spiritix

src/Spiritix/HtmlToPdf/Output/DownloadOutput.php

@@ -49,12 +49,12 @@ public function download($fileName, $exit = true)
         header('Content-Type: application/pdf', false);
         header('Content-Disposition: attachment; filename="' . basename($fileName) .'";');
         header('Content-Transfer-Encoding: binary');
-        header('Content-Length: ' . mb_strlen($this->getPdfData()));
+        header('Content-Length: ' . strlen($this->getPdfData()));
 
         echo $this->getPdfData();
 
         if ($exit === true) {
             exit;
         }
     }
-}
+}