backport some consistency with trunks mod_cache:
* mod_cache, mod_disk_cache: Try to use the key of a possible open but stale cache entry if there is one. This fixes problem when two different cache locks have been created for single stale cache entry leading to two requests sent to backend. PR 50317 * Remove useless apr_file_remove() before renaming the cache entry in mod_disk_cache. This fixes small time-frame during which stale cache entry can be seen as not-cached. PR 50317 Subitted By: rpluem, jkaluza, ylavic Reviewed By: ylavic, rpluem, jkaluza git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1608838 13f79535-47bb-0310-9956-ffa450edef68
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