how can I using URL?

[yejun]

when I using   URL url=new URL(proxyURL);         java.net.HttpURLConnection httpConn=(HttpURLConnection) url.openConnection();   httpConn.setDoOutput(true);        httpConn.setDoInput(true);        //httpConn.setUseCaches(false);        httpConn.setRequestMethod("GET");        httpConn.setUseCaches(true);        httpConn.setRequestProperty("filename","test.xml");     how can I set the Http parameter ??           Tel��67800438 Fax��67800386 E-mail: [EMAIL PROTECTED]