static ThreadLocal<Map<S, L<S>>> loadBinaryPage_responseHeaders = new ThreadLocal;

static ThreadLocal<SS> loadBinaryPage_extraHeaders = new ThreadLocal;

static byte[] loadBinaryPage(String url) ctex {

  print("Loading " + url);

  return loadBinaryPage(loadPage_openConnection(new URL(url)));

}

static byte[] loadBinaryPage(URLConnection con) ctex {

  SS extraHeaders = getAndClearThreadLocal(loadBinaryPage_extraHeaders);

  setHeaders(con);

  for (S key : keys(extraHeaders))

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

  ret loadBinaryPage_noHeaders(con);

}

static byte[] loadBinaryPage_noHeaders(URLConnection con) ctex {

  ByteArrayOutputStream buf = new ByteArrayOutputStream();

  InputStream inputStream = con.getInputStream();

  loadBinaryPage_responseHeaders.set(con.getHeaderFields());

  long len = 0;

  try { len = con.getContentLength/*Long*/(); } catch (Throwable e) { printStackTrace(e); }

int n = 0;

  while (true) {

    int ch = inputStream.read();

    if (ch < 0)

      break;

    buf.write(ch);

    if (++n % 100000 == 0)

      println("  " + n + (len != 0 ? "/" + len : "") + " bytes loaded.");

  }

  inputStream.close();

  return buf.toByteArray();

}