title: ActiveResource error response header doesn't return body
body: <p>I asked something similar to this before and never got an answer, here's a shortened version</p>
  
  <p>I have a User activeresource model.  I make a simple call on my client to the service</p>
  
  <pre><code>response = User.find(id).put(:activate, :activation_code =&gt; activation_code)
  </code></pre>
  
  <p>If there were errors on the service (ie. activation_code didn't match) I return</p>
  
  <pre><code>render :xml =&gt; @user.errors, :status =&gt; :unprocessable_entity
  </code></pre>
  
  <p>So apparently any error response with activeresource must be handled by a resue </p>
  
  <pre><code>rescue ActiveResource::ResourceInvalid
  </code></pre>
  
  <p>That's all fine and dandy, except that the response in the initial call does not get set.  I have no body from that response at all, so @user.errors is never returned.  What do I need to get the proper object back?  besides returning 200.  Any 'success' response code populates the response variable fine.  But always returning 200 seems like a mistake.</p>