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

== Odpowied serwera ==
HTTP/1.1 200 OK
ETag: "387060f9402aca1:5fff-35"
Date: Wed, 07 Sep 2011 08:57:04 GMT

== Drugie danie klienta ==
GET /etag.php HTTP/1.1
Host:witrynademophp.site
If-None-Match: "387060f9402aca1:5fff-35"
