function FindProxyForURL(url, host) {
    var blockedDomains = [
        "4cdn.org"
    ];

    host_parts = host.split(".");

    if (host_parts < 2) {
        return "DIRECT";
    }

    var domain = "";

    for (var domain_level = 2; domain_level <= host_parts.length; domain_level++) {
        domain = domain_parts.splice(-1 * domain_level);
        if (blockedDomains.indexOf(domain) != -1) {
            return "HTTPS proxy.antizapret.prostovpn.org:3143; PROXY proxy.antizapret.prostovpn.org:3128; DIRECT";
        }
    }

    return "DIRECT";
}