--TEST-- http_send() failed precondition --SKIPIF-- --ENV-- HTTP_RANGE=bytes=0-1 HTTP_IF_UNMODIFIED_SINCE=Thu, 01 Jan 1970 00:16:40 GMT --FILE-- --EXPECTF-- Status: 412%s X-Powered-By: %s Cache-Control: private, must-revalidate, max-age=0 Last-Modified: %s Accept-Ranges: bytes Content-type: text/html