使用HttpClient Java在代理中使用主机名代替ip

我想使用包含主机名而不是ip的代理。 示例：myproxydomain.com:8080:username:password 我不知道怎么做，这是我的ip:port:username:password代理代码

HttpClient client = new HttpClient();
    client.getParams().setParameter( HttpMethodParams.USER_AGENT,UA );
    HostConfiguration config = client.getHostConfiguration();
    
    String proxy = myProxies[new Random().nextInt(myProxies.length)];
    String[] parts = proxy.split(":");
    String host = parts[0];
    String port = parts[1];
    config.setProxy(host, Integer.parseInt(port));
        if (parts.length > 2) {
            String proxyUsername = parts[2];
            String proxyPassword = parts[3];
            Credentials credentials = new UsernamePasswordCredentials(proxyUsername, proxyPassword);
            AuthScope authScope = new AuthScope(host, Integer.parseInt(port));
            client.getState().setProxyCredentials(authScope, credentials);
        }

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所以有什么问题吗？您是否收到错误？是407错误，但使用基于ip的代理时没有错误