I just realised that WGSI doesn't allow applications to send headers as trailers (RFC2616, 3.6.1 Chunked Transfer Coding). I think that's OK, as pretty much nobody uses them, and it would require a pretty radical change in WGSI's design to support them, but I think the PEP should mention it. Cheers, -- Mark Nottingham http://www.mnot.net/