pan class="ruby-value">:extension</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;xml&#39;</span>, <span class="ruby-value">:content_type</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;application/xml&#39;</span>) ]

  <span class="ruby-comment"># Determine which content types are used most often, and add them to the list of defaults</span>
  <span class="ruby-identifier">content_types_by_ext</span>.<span class="ruby-identifier">each_pair</span>