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> The paper compares plain, deflate, and deflate + prefix dictionary. Prefix is only a benefit on the first request and response, adding up to 121 on average in their test.

As far as I can tell, it seems to compare plain, deflate with SPDY's current prefix dictionary, and deflate with the paper's proposed prefix dictionary.

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You are correct, the paper does not compare to compression with a null prefix. In haste I read it wrong, since it was not too far off from calculations I had done previously in a reddit discussion where I found ~100 bytes saved using the prefix dictionary. Thanks for being persistent and I'll see if I can rerun their data using a null prefix before the next Spdy thread, but I doubt it will show more than 200 bytes total savings per connection, which doesn't change anything IMO.

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