Fixed `yii\web\Response::xSendFile()` does not reset format

framework/CHANGELOG.md

@@ -14,6 +14,7 @@ Yii Framework 2 Change Log
 - Bug #8544: Fixed `yii\db\ActiveRecord` does not updates attribute specified at `optimisticLock()` after save (klimov-paul)
 - Bug #8585: Fixed `yii\helpers\Html::activeTextarea()` does not allow value overriding via options (klimov-paul)
 - Bug #8593: Fixed `yii\db\ActiveQuery` produces incorrect SQL for aggregations, when `sql` field is set (klimov-paul)
+- Bug #8606: Fixed `yii\web\Response::xSendFile()` does not reset format (vyants)
 - Bug: Fixed string comparison in `BaseActiveRecord::unlink()` which may result in wrong comparison result for hash valued primary keys starting with `0e` (cebe)
 - Bug: Pass correct action name to `yii\console\Controller::options()` when default action was requested (cebe)
 - Bug: Automatic garbage collection in `yii\caching\FileCache` was not triggered (kidol)

framework/web/Response.php

@@ -687,6 +687,8 @@ class Response extends \yii\base\Response
             ->setDefault('Content-Type', $mimeType)
             ->setDefault('Content-Disposition', "{$disposition}; filename=\"{$attachmentName}\"");
 
+        $this->format = self::FORMAT_RAW;
+
         return $this;
     }