mark_roach - 7:34 am on Mar 15, 2011 (gmt 0)
I'm not on proxy
I am no expert in this area but I suspect every web request goes through some form of proxy server. For example your ISP will use a proxy.
I have just run a pagespeed test on a laptop using two different network connections. One reported that GZIP was used, the other said it wasn't.
Browserscope also confirmed these findings.