upload file proxy invalid

http://xxxx/aaa
`
$request = ServerRequestFactory::fromGlobals();
$guzzle = new \GuzzleHttp\Client();
$proxy = new Proxy(new GuzzleAdapter($guzzle));
$response = $proxy->forward($request)->to('http://yyyy');
`

action code in http://yyyy/aaa
`
var_dump($_GET,$_FILES);
`

`
curl -F "media=@a.png" "http://xxxx/aaa?type=image"
`
result:
array(1) {
["type"]=>
string(5) "image"
}
array(0) {
}