client/invite.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="/CSS/login.css">
    <script src="/scripts/encryption.js"></script>
    
    <title>proto-chat</title>
    <script>
        window.onload = (e) => {
            var req = new XMLHttpRequest();
            req.open('POST', `${window.location.origin}/invite`, true);
            // req.responseType = 'text';
            const serverId = window.location.pathname.replace("/invite/", "");
            if (!serverId) window.location.pathname = '/';
        
            req.onloadend = () => {
                try {
                    if (req.response == 'OK') window.location.pathname = `/server/${serverId}`;
                    else alert("ERROR!");
                    console.log(req.response);
                }
                catch(err) {
                    console.error(err);
                    console.log(req.response);
                    alert("ERROR!");
                }
            }
        
            req.setRequestHeader('sessionid', localStorage.getItem('sessionid'));
            req.setRequestHeader('serverid', serverId);
            req.send();
        }
    </script>
</head>
<body style="color:whitesmoke">
    <h1 style="text-align: center;">Processing Request...</h1>
</body>
</html>