public Socks5(String proxyHost, int proxyPort) { this(proxyHost, proxyPort, null, null);
public Socks5(String proxyHost, String proxyUser, String proxyPass) { this(proxyHost, -1, -1, proxyUser, proxyPass);
    public Socks5(String proxyHost, int proxyPort) {    	this(proxyHost, proxyPort, null, null);    }