svoid doPostBinaryToFile(Map urlParameters, S url, File file) {
  doPostBinaryToFile(makePostData(urlParameters), url, file);
}

svoid doPostBinaryToFile(S urlParameters, S url, File file) ctex {
  URL _url = new URL(url);
  ping();
  doPostBinaryToFile(urlParameters, _url.openConnection(), file);
}

svoid doPostBinaryToFile(String urlParameters, URLConnection conn, File file) throws IOException {
  // connect and do POST
  setHeaders(conn);
  conn.setDoOutput(true);

  OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
  writer.write(urlParameters);
  writer.flush();

  try {
    loadBinaryPageToFile_noHeaders(conn, file);
  } finally {
    writer.close();
  }
}

Began life as a copy of #1005869