Send ajax jquery with some content-type

send-ajax.js

// multpart/data
$('form').on('submit', function (e) {
    e.preventDefault();
    var form = new FormData($(this)[0]);
    $.ajax({
        method: "POST",
        url: URL,
        data: form,
        processData: false,
        contentType: false,
        dataType: 'json|html|text'
    });
});

// application/x-www-form-urlencoded
$('form').on('submit', function (e) {
    e.preventDefault();
    var form = $(this);
    $.ajax({
        method: "POST",
        url: URL,
        data: form.serialize(),
        contentType: "application/x-www-form-urlencoded; charset=utf-8",
        dataType: 'json|html|text'
    });
});

// application/json
$('form').on('submit', function (e) {
    e.preventDefault();
    var data = {nome: '', email: ''};
    $.ajax({
        method: "POST",
        url: URL,
        data: {data : data},
        contentType: "application/json; charset=utf-8",
        dataType: 'json|html|text'
    });
});