small Java HTTP client

HttpClient.java

package httpclient;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class HttpClient {
    public static void main(String[] args) {
        if (args.length != 1) {
            System.err.println("Usage: httpclient <url>");
            return;
        }
        
        try {
            URL url = new URL(args[0]);
            URLConnection client = url.openConnection();
            InputStream inputStream = client.getInputStream();
            
            byte[] buf = new byte[1024];
            for (int len; (len = inputStream.read(buf)) > 0;) {
                System.out.write(buf, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace(System.err);
        }
    }
}