Android studio无法将数据插入到mysql数据库cpanel中

I try to insert data from android app into mysql database on cpanel using web server. I test the code from postman, data inserted to the db, but when i try to use the app, data can't insert. then i try use a 000webhost cpanel as a server, it works there. What should i do?

sorry my english is not good

Insert data to mysql

if($_SERVER['REQUEST_METHOD']=='POST'){

include ('koneksi.php');

$seri       = $_POST['seri'];
$tipe       = $_POST['tipe'];
$spinner    = $_POST['spinner'];
$kelurahan  = $_POST['kelurahan'];
$kecamatan  = $_POST['kecamatan'];
$kota       = $_POST['kota'];
$kode       = $_POST['kodepos'];


$sql = "INSERT INTO manual (seri, tipe, spinner, kelurahan, kecamatan, kota, kodepos)
VALUES ('$seri', '$tipe', '$spinner', '$kelurahan', '$kecamatan', '$kota', '$kode');";

if (mysqli_query($con, $sql)) {
    echo "Data berhasil disimpan";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($con);
}

mysqli_close($con);

}