On Tue, Feb 6, 2018 at 5:12 PM, Brandon Williams [off-list ref] wrote:

One of the design goals of protocol-v2 is to improve the semantics of
flush packets.  Currently in protocol-v1, flush packets are used both to
indicate a break in a list of packet lines as well as an indication that
one side has finished speaking.  This makes it particularly difficult
to implement proxies as a proxy would need to completely understand git
protocol instead of simply looking for a flush packet.

To do this, introduce the special deliminator packet '0001'.  A delim
packet can then be used as a deliminator between lists of packet lines
while flush packets can be reserved to indicate the end of a response.

Please mention where this can be found in the documentation.
(Defer to later patch?)
As the commit message states, this is only to be used for v2,
in v0 it is still an illegal pkt.

Signed-off-by: Brandon Williams <redacted>

The code is
Reviewed-by: Stefan Beller <redacted>