function unsecureRequestWarning(url) {
    return (
        "<h3 >Warning: Are you sure you want to do this?</h3>" +
        "<p>You are about to send login credentials via an insecure connection!</p>" +
        "<p>If there is an attacker watching your network traffic, they may be able to see your username and password.</p>" +
        `<p>URL: <strong>${url}</strong></p>`
    );
}
Returns warning html string with unsecure url specified
@returns html string