sS witAI_recognizeAudio(File audioFile, S mimeType) {
  ret witAI_recognizeAudio(audioFile, mimeType, 'english);
}

sS witAI_recognizeAudio(File audioFile, S mimeType, S language) ctex {
  if (audioFile.length() == 0) fail("No file: " + audioFile);
  print("Calling wit.ai with " + toK(audioFile.length()) + " K " + mimeType + "...");
  long time = sysNow();
  
  S token = witAITokenForLanguage(language);
  URL url = new URL("https://api.wit.ai/speech?v=20160526");
  URLConnection con = url.openConnection();
  con.setRequestProperty("Authorization", "Bearer " + token);
  con.setRequestProperty("Content-Type", mimeType);
  
  con.setDoOutput(true);
  OutputStream out = con.getOutputStream();
  file2stream(audioFile, out);
  out.flush();

  S json = loadPage(con, url);
  print(json);
  out.close();
  done2_always("wit.ai", time);
  ret getString(jsonDecodeMap(json), "_text");
}