Proxy gateways and multi-part documents

Hi,
We are trying to send a multi-part document (for use with Netscape
server push) through a proxy gateway. It seems that the gateway
just reads the first Content-Length header and only sends the first part.

Is this because the proxy attempts to cache ? If so is there a header
that the server can send to stop this behaviour ?

Also, does anyone know of any proxies that do support (infinitley big)
multipart documents ? Is there an RFC for proxies ?

Many thanks in advance,
Jim.
-- 
Jim Vaughan, Active Imaging (UK) Ltd.
Mail:  jim@active.imaging.co.uk Web: http://www.active.imaging.co.uk
Phone: +44 1628 415444          Fax: +44 1628 415445