-+ Added INI setting http.force_exit which can be used to disable script termination
- in case of redirects and positive cache hits (instead, standard output will be discarded)
-+ Classes HttpMessage and HttpRequestPool implement Countable if PHP >= 5.1 with SPL is available
-+ Class HttpMessage implements Serializable if PHP >= 5.1 is available
-+ Added experimental http.chunked_encode and chunked_decode stream filter