mod_http_oauth2: Fire authentication events on login form For e.g. mod_audit_auth to use. A bit hacky because upon review many modules don't seem to handle the lack of an XMPP session in the event payload.

<tr>
  <th>What is {x} {op} {y}?</th><td>
    <input name="captcha_challenge" type="hidden" value="{challenge}">
    <input name="captcha_reply" pattern="[0-9]+" required type="number">
  </td></tr>