Call Webservice myslim

First of all i am sorry if gone be confuse, i don't understand nothing about web-service. So i do a web-service myslim.

structure

inside api

aluno.php:

$app->get('/api/alunos', function(){
require_once('db/dbconnect.php');
foreach ($db->alunos()
             ->order("nome")
         as $row){
    $data[]=$row;
}
echo json_encode($data, JSON_UNESCAPED_UNICODE);
});
 ?>

That work well in my android app, but now i want do web, but i don't know how to call, already see some code but dont work maybe i am searching wrong information