Recently discovered:

GET / HTTP/1.1
Host: www.zappos.com
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

HTTP/1.1 200 OK
Server: nginx/0.8.34
Content-Type: text/html;charset=ISO-8859-1
Last-Modified: Thu, 08 Jul 2010 01:11:30 GMT
X-Cash: cash
X-Varnish-TTL: 60m
X-Varnish: 800776638 800726424
X-Core-Value: 1. Deliver WOW Through Service
X-Recruiting: If you're reading this, maybe you should be working at Zappos instead.  Check out jobs.zappos.com
X-UUID: a75c0eae-9389-11df-80aa-00215e22da70
Content-Encoding: gzip
Content-Length: 14482
Vary: Accept-Encoding
Cache-Control: max-age=866
Date: Wed, 21 Jul 2010 17:07:14 GMT
Connection: keep-alive

Emphasis mine.