PHP script doesn't receive - or doesn't read - POST JavaScript

I'm trying to send a body as a query to a PHP script, but when I treat the information as "$query['param']", this information is returned as undefined.

The JavaScript code I'm using to send the information is as follows:

function insertNewRecord(data) {

    fetch('/configs/database/add.php', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/x-www-form-urlencoded'
        },
        body: `name=${data.name}&contact=${data.contact}&delivery=${data.delivery}&value=${data.value}`
    })
    .then(function(response) {
        if (response.ok) {
            return response.text();
        }
        throw new Error('Error in the request.');
    })

    var table = document.getElementById("employeeList").getElementsByTagName('tbody')[0];
    var newRow = table.insertRow(table.length);
    cell1 = newRow.insertCell(0);
    cell1.innerHTML = data.name;
    cell2 = newRow.insertCell(1);
    cell2.innerHTML = data.contact;
    cell3 = newRow.insertCell(2);
    cell3.innerHTML = data.delivery;
    cell4 = newRow.insertCell(3);
    cell4.innerHTML = data.value;
    cell4 = newRow.insertCell(4);
    cell4.innerHTML = `<a onClick="onEdit(this)">Edit</a>
                       <a onClick="onDelete(this)">Delete</a>`;
}

And the PHP script I'm using to receive the request is as follows:

<?php 

    $protocol = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";  
    $CurPageURL = $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];  
    $parts = parse_url($CurPageURL);

    if(count($parts) <= 3) return;

    parse_str($parts['query'], $query);

    $conn = OpenCon();

    $sql = "INSERT INTO users (name, contact, delivery, value) VALUES (" . $query['name'] . ", " . $query['contact'] . ", " . $query['delivery'] . ", " . $query['value'] . ")";
    $result = $conn->query($sql);

?>

What should I do/change to fix this problem? I'm trying to do a CRUD in PHP, but this problem has been disturbing my work and I'm not able to solve it myself.

source https://stackoverflow.com/questions/76528384/php-script-doesnt-receive-or-doesnt-read-post-javascript