final URL testURL = new URL(hg18URL);
PreferenceManager mgr = PreferenceManager.getInstance();
mgr.override(PreferenceManager.PROXY_HOST, "igvdev01.broadinstitute.org");
mgr.override(PreferenceManager.PROXY_PORT, "3128");
mgr.override(PreferenceManager.PROXY_USER, "proxytest");
String enc_pword = Utilities.base64Encode("test@123");
mgr.override(PreferenceManager.PROXY_PW, enc_pword);
mgr.override(PreferenceManager.USE_PROXY, "true");
mgr.override(PreferenceManager.PROXY_AUTHENTICATE, "true");
HttpUtils.getInstance().updateProxySettings();