title: Enable service_url in ejabberd using mod_http_upload
body: <p>I'm using ejabberd 15.09 and mod_http_upload.
  According to <code>https://github.com/weiss/mod_http_upload</code> , if <code>service_url</code> is defined then, upload service should be forwarded to the given link.
  However, even though I have define the <code>service_url</code> link, it still reverts to <code>put_url</code>.
  How do I configure mod_http_upload to use <code>service_url</code> ?</p>