Hello.
In yii 2.0.3 in file Response.php (vendor\yiisoft\yii2\web\Response.php) in function [prepare] in 923 sting number I found:
if ($this->stream !== null) {
return;
}
instead of (in yii 2.0.2):
if ($this->stream !== null || $this->data === null) {
return;
}
and now function Yii::$app->response->sendContentAsFile() does not work.
I think this is bug! 