Tell them your "server" is at a different port. Build a proxy server out of Apache you compile yourself, or a preforking compressing proxy server in 100 lines of Perl that points at your actual application. Since you control the headers on this server, life is good.

Perl rules. Perl saves. Perl wins the battle against people who shouldn't be peering that closely at the header, especially considering some of their own promotions ran on Apache on a Unix box (second-hand reliable info, see the mod_perl archives for details).

-- Randal L. Schwartz, Perl hacker