Hope I found the right discussion for people who develop SPDY (http://
sites.google.com/a/chromium.org/dev/spdy/spdy-whitepaper).

Have the SPDY designers thought about how to efficiently handle
"frequent transmission of similar dynamic content?"  In particular,
one approach is for the server to assume the client has an older
version of the content of some resource, and just send some binary
signatures which would allow the client to calculate the "diff" in the
content.  The client then only needs to request the blocks of data
which have changed.

More-complete details (as this idea is not my own):
http://rproxy.samba.org/doc/protocol/protocol.html

I was looking at the SPDY whitepaper.  Something like this could be
integrated with the "server hint" feature (see Advanced Features
section in whitepaper).

So, what do you think?

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