ZF-2329: Zend_Cache should remember HTTP headers (Content-Type) when using Zend_Cache_Frontend_Page
Example: An XML document is output with the Content-Type header set to text/xml. Zend_Cache_Frontend_Page is used and when retrieving a cached copy, the Content-Type header is incorrectly set to text/html.
See http://xeaura.xeaura-host.co.uk/sitemap.xml for an example. The cache time is about 15 seconds. Initiall you will see the document with the correct content-type (and correctly formatted in Firefox), refreshing will give you the cached copy (wrong content-type and not formatted in Firefox).