== Pierwsze danie od klienta ==
GET /lastmodified.php HTTP/1.1
Host: witrynademophp.site

== Odpowied serwera ==
HTTP/1.1 200 OK
Last-Modified: Mon, 05 Sep 2011 07:31:07 GMT
Date: Wed, 07 Sep 2011 08:57:04 GMT

== Drugie danie klienta ==
GET /lastmodified.php HTTP/1.1
Host:witrynademophp.site
If-Modified-Since: Mon, 05 Sep 2011 07:31:07 GMT

== Odpowied serwera ==
HTTP/1.1 304 Not Modified
Date: Wed, 07 Sep 2011 08:57:13 GMT
