On Mon, Jan 23, 2012 at 12:44, S Ahmed <[email protected]> wrote:
>
> Excuse my newbieness, but why couldn't this be done at layer4 in the tcp hand 
> shake?

Not can't, but shouldn't.  For one example: what if the client
pipelines multiple requests in one connection?  TCP is not aware of
whether this is your first or 15th request for a given resource in the
given connection.
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