Fix [ZF-4554]: Update Zend_Http_Client so that lookups on the internal headers array are always performed using a normalized (lowercase) key.
Fix [ZF-4554]: Update Zend_Http_Client so that lookups on the internal
headers array are always performed using a normalized (lowercase) key.

This was causing the Content-Length headers to be reused between requests,
resulting in server timeouts.


git-svn-id: abaeb2b3ba5a94ed391a9405ad7d63d0414021c9@11857 44c647ce-9c0f-0410-b52a-842ac1e357ba

grzana12/ZendFramework,grzana12/ZendFramework,grzana12/ZendFramework,sandsmedia/zf,sandsmedia/zf,sandsmedia/zf,grzana12/ZendFramework