title: URL Issues in CakePHP 2.3
body: <p>I have a decent history with CakePHP 1.3, but am working on my first 2.x (2.3, in this case) app and have bumped into what <em>appears</em> to be a couple of odd issues with URL generation that I'm hoping someone can help me with.</p>
  
  <ol>
  <li><p>I have a form that I'd like to submit to the same action with a different extension (<code>.csv</code>).  To do so, I tried:</p>
  
  <pre><code># FYI, $this-&gt;here = /admin/activities/index
  $this-&gt;Form-&gt;create('Activity', 
    array( 'admin' =&gt; true, 'controller' =&gt; 'activities', 'action' =&gt; 'index', 'ext' =&gt; 'csv' )
  </code></pre>
  
  <p>What I get as my form action is <code>action=".csv"</code>.</p></li>
  <li><p>As a possible workaround, I tried simply setting the url as a string -- <code>'url' =&gt; '/admin/activities/index.csv'</code>. Now the form <code>action</code> looks right, but when I submit the form I get an error.</p>
  
  <pre><code>Error: The action admin_index.csv is not defined in controller ActivitiesController
  </code></pre></li>
  </ol>
  
  <p>What am I missing here? I've read through the 2.3 FormHelper &amp; Router docs as well as the migration docs for each version I've "skipped" (2.1, 2.2, 2.3) and I don't see anything that jumps out at me, but it wouldn't be the first time I've missed something.</p>