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mod_http_oauth2: Improve handling of redirect_uri matching and fallback Per OAuth 2.1, the client MUST provide a redirect_uri explicitly if it registered multiple. If it only registered a single URI, it may be omitted from the authorize request.

<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>