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GET /tile.ashx?T=1&S=13&X=321&Y=3329&Z=10 HTTP/1.1\r\n
Accept: , , , , , , M\360\017\204-\002\r\n
User_Agent: Perl-Win32::Internet/0.081\r\n
Host: terraserver-usa.com\r\n
\r\n

GET /tile.ashx?T=1&S=13&X=321&Y=3329&Z=10 HTTP/1.1\r\n
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 98) Opera 7.23 
+[en]\r\n
...
Connection: Keep-Alive, TE\r\n
TE: deflate, gzip, chunked, identity, trailers\r\n
\r\n

sub Get {
    my ($url, $req) = @_;
...
        return undef
    }
}