static new ThreadLocal<Bool> doPost_silently;

static new ThreadLocal<Long> doPost_timeout;

static new ThreadLocal<SS> doPost_extraHeaders;

sS doPost(S url, Map urlParameters) {

  ret doPost(urlParameters, url);

}

sS doPost(Map urlParameters, S url) {

  ret doPost(makePostData(urlParameters), url);

}

static String doPost(S urlParameters, String url) ctex {

  URL _url = new URL(url);

  ping();

  return doPost(urlParameters, _url.openConnection(), _url);

}

static String doPost(S urlParameters, URLConnection conn, URL url) ctex {

  bool silently = isTrue(optParam(doPost_silently));

  Long timeout = optParam(doPost_timeout);

  SS extraHeaders = optPar(doPost_extraHeaders);

  setHeaders(conn);

  for (S key : keys(extraHeaders)) {

    ifdef doPost_debug

      print("doPost sending header: " + key + " = " + extraHeaders.get(key));

    endifdef

    conn.setRequestProperty(key, extraHeaders.get(key));

  }

  int l = lUtf8(urlParameters);

  if (!silently)

    print("Sending POST request: " + hideCredentials(url) + " (" + l + " bytes)");

  // connect and do POST

  if (timeout != null) setURLConnectionTimeouts(conn, timeout);

  cast conn to HttpURLConnection;

  conn.setRequestMethod("POST");

  conn.setDoOutput(true);

  conn.setFixedLengthStreamingMode(l);

  //conn.setRequestProperty("Content-Length", str(l));

  OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");

  writer.write(urlParameters);

  writer.flush();

  String contents = loadPage_utf8(conn, url, false);

  writer.close();

  return contents;

}