ass='label'>oauth_callback:</span> <span class='id identifier rubyid_return_url'>return_url</span><span class='rparen'>)</span>
    <span class='id identifier rubyid_callback'>callback</span><span class='period'>.</span><span class='id identifier rubyid_call'>call</span> <span class='id identifier rubyid_request_token'>request_token</span>
    <span class='kw'>return</span> <span class='kw'>nil</span>
  <span class='kw'>end</span>
<span class='kw'>end</span></pre>
    </td>
  </tr>
</table>
</div>
    
    