如何使用PHP制作firebase动态链接？

Question

I want to generate firebase dynamic link using php but file_get_content() failed to open stream.

It work fine on nodejs but when i try to make through php. it don't

<?php 


$postdata=http_build_query(
    array(
        'longDynamicLink' => 'https://YOURDOMAIN.page.link/?link=https://www.google.com/&apn=com.example.android&ibi=com.example.ios'
    )
);
$opts=array(
    'http'=>
    array(
        'method'=>'POST',
        'header' =>'content-type:application/json',
        'content'=> $postdata
    )
);
echo 'i m here';
$context=stream_context_create($opts);
$url='https://firebasedynamiclinks.googleapis.com/v1/shortLinks?key=API KEY';
$response=file_get_contents($url,false,$context);
echo 'res';
echo $response;

die;

 ?>

Warning: file_get_contents(https://firebasedynamiclinks.googleapis.com/v1/shortLinks?key=API KEY): failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request in C:\wamp64\www\testphp\test3.php on line 21