static InputStream httpInputStream(S url) throws IOException {
  if (!isAbsoluteURL(url)) null;
  print("Streaming " + url);
  ret httpInputStream(openConnection(new URL(url)));
}

static InputStream httpInputStream(URLConnection con) throws IOException {
  setHeaders(con);
  ret urlConnection_getInputStream(con);
}

Began life as a copy of #1008030