Zend Page Cache - saved cache is empty #113
Description
Somehow, Zend Page Cache is able to cache completely empty pages (that should have content). The $data it saves can be completely empty in certain circumstances.
I have no idea how it happens, but one way is from a server performing a HEAD request on a page. It seems to save the empty response body of the HEAD request to a cache file. I've seen this by adding logging where it posts the $_SERVER variables to the text file along with the $data. $data is empty, but $_SERVER['REQUEST_METHOD'] is HEAD.
Other ways the cache is sometimes empty seems to be from Baidu spider and yandex spider. I honestly cannot figure this out.
Due to the nature of the page cache dieing after it echo's the $data on _flush, this results in an empty page being served to users. I've had to modify _flush to add:
if(empty($data)) return true;
else die();
Has anyone else ever experienced this? Is there any other way to fix it?