I couldn't find anything specific on Google on how to accept GZIP encoded files/connections/jargon, but stumbled on the solution after a bit of headscratching.
on *:SockOpen:whoopdoopsockname: {
sockwrite -nt $sockname GET /video/streams/?xml=1&filter=live HTTP/1.1
sockwrite -nt $sockname User-Agent: mIRC script by you! Should put something descriptive here as well as contact information to make webadmins happy in case something breaks =D
sockwrite -nt $sockname Host:
www.mygzippedwebsite.com sockwrite -nt $sockname Accept-Encoding: gzip,deflate,text
sockwrite -nt $sockname $crlf
}
So here's the answer for future Googlers of mIRC questions!
Edit: For those who might not know their encoding is wrong, you might get something like this error:
HTTP/1.1 406 Not Acceptable
Content-Type: text/plain
Connection: close