fix crash on unset request urls


git-svn-id: http://svn.php.net/repository/pecl/http/branches/DEV_2@332119 c90b9560-bf6c-de11-be94-00142212c4b1
fix ZTS


git-svn-id: http://svn.php.net/repository/pecl/http/branches/DEV_2@332120 c90b9560-bf6c-de11-be94-00142212c4b1
http\Client implements Countable


git-svn-id: http://svn.php.net/repository/pecl/http/branches/DEV_2@332121 c90b9560-bf6c-de11-be94-00142212c4b1