Visual Studio 2017 + Cordova - > 404通过ajax在php文件上

Question

These are my first steps on Visual Studio and Cordova. I tried to insert data in a database (running through uwamp port 80) thanks to cordova (port 4400). My index file is loaded, i fill my form and post it but it says that my php file (the one called in ajax) is not found!

html:

<input type="button" id="poster" value="Poster l'offre de team" />

js:

var button = document.getElementById('poster');
    button.addEventListener('click', validAjoutOffre);

    function validAjoutOffre() {
        var pseudo = document.getElementById('pseudo').value;
        var plateforme = document.getElementById('plateforme').value;
        var telephone = document.getElementById('telephone').value;
        var lvlmini = document.getElementById('lvlmini').value;
        var commentaire = document.getElementById('commentaire').value;
        var legende = document.getElementById('legende').value;

        $.ajax({
            type: "POST",  //Request type
            url: "http://localhost:4400/validoffreteam.php",   
            data:{ pseudo: pseudo, plateforme: plateforme, telephone: telephone, lvlmini: lvlmini, commentaire: commentaire, legende: legende},
            cache:false,
            success:function (data) {
                window.location.href = 'validajoutoffre.html';
            }
         });
    }

The error is: jquery.js:9601 POST http://localhost:4400/validoffreteam.php 404 (Not Found)

The address http://localhost:4400/validoffreteam.php is correct and it downloads me the php file when i go on it.

What can be the problem?

Regards, Archetype