gzip support

I've been thinking about gzip Content-Encoding, and it seems to me
that Vary support isn't really necessary. Here's my idea:

. Add a filter for which content-types should be gzip'd (default to
text/*)
. Request all content in gzip encoding; store as received
. Compress non-gzip content in the background
. Track both the compressed and uncompressed content-lengths
. Do on-the-fly decompression as needed for the extremely rare
browsers that don't request gzip

Thoughts?

S

-- 
Stephen Sprunk         "God does not play dice."  --Albert Einstein
CCIE #3723         "God is an inveterate gambler, and He throws the
K5SSS        dice at every possible opportunity." --Stephen Hawking