Git Wire Protocol, Version 2

003egit-upload-pack /project.git\0host=myserver.com\0\0version=2\0

C: GET $GIT_URL/info/refs?service=git-upload-pack HTTP/1.0
C: Git-Protocol: version=2

S: 200 OK
S: <Some headers>
S: ...
S:
S: 000eversion 2\n
S: <capability-advertisement>

   symrefs
In addition to the object pointed by it, show the underlying ref
pointed by it when showing a symbolic ref.
   peel
Show peeled tags.
   ref-prefix <prefix>
When specified, only references having a prefix matching one of
the provided prefixes are displayed.

output = *ref
  flush-pkt
ref = PKT-LINE(obj-id SP refname *(SP ref-attribute) LF)
ref-attribute = (symref | peeled)
symref = "symref-target:" symref-target
peeled = "peeled:" obj-id

   want <oid>
Indicates to the server an object which the client wants to
retrieve.  Wants can be anything and are not limited to
advertised objects.

   have <oid>
Indicates to the server an object which the client has locally.
This allows the server to make a packfile which only contains
the objects that the client needs. Multiple 'have' lines can be
supplied.

   done
Indicates to the server that negotiation should terminate (or
not even begin if performing a clone) and that the server should
use the information supplied in the request to construct the
packfile.

   thin-pack
Request that a thin pack be sent, which is a pack with deltas
which reference base objects not contained within the pack (but
are known to exist at the receiving end). This can reduce the
network traffic significantly, but it requires the receiving end
to know how to "thicken" these packs by adding the missing bases
to the pack.

   no-progress
Request that progress information that would normally be sent on
side-band channel 2, during the packfile transfer, should not be
sent.  However, the side-band channel 3 is still used for error
responses.

   include-tag
Request that annotated tags should be sent if the objects they
point to are being sent.

   ofs-delta
Indicate that the client understands PACKv2 with delta referring
to its base by position in pack rather than by an oid.  That is,
they can read OBJ_OFS_DELTA (aka type 6) in a packfile.

   shallow <oid>
A client must notify the server of all commits for which it only
has shallow copies (meaning that it doesn't have the parents of
a commit) by supplying a 'shallow <oid>' line for each such
object so that the server is aware of the limitations of the
client's history.  This is so that the server is aware that the
client may not have all objects reachable from such commits.

   deepen <depth>
Requests that the fetch/clone should be shallow having a commit
depth of <depth> relative to the remote side.

   deepen-relative
Requests that the semantics of the "deepen" command be changed
to indicate that the depth requested is relative to the client's
current shallow boundary, instead of relative to the requested
commits.

   deepen-since <timestamp>
Requests that the shallow clone/fetch should be cut at a
specific time, instead of depth.  Internally it's equivalent to
doing "git rev-list --max-age=<timestamp>". Cannot be used with
"deepen".

   deepen-not <rev>
Requests that the shallow clone/fetch should be cut at a
specific revision specified by '<rev>', instead of a depth.
Internally it's equivalent of doing "git rev-list --not <rev>".
Cannot be used with "deepen", but can be used with
"deepen-since".

   filter <filter-spec>
Request that various objects from the packfile be omitted
using one of several filtering techniques. These are intended
for use with partial clone and partial fetch operations. See
`rev-list` for possible "filter-spec" values. When communicating
with other processes, senders SHOULD translate scaled integers
(e.g. "1k") into a fully-expanded form (e.g. "1024") to aid
interoperability with older receivers that may not understand
newly-invented scaling suffixes. However, receivers SHOULD
accept the following suffixes: 'k', 'm', and 'g' for 1024,
1048576, and 1073741824, respectively.

   want-ref <ref>
Indicates to the server that the client wants to retrieve a
particular ref, where <ref> is the full name of a ref on the
server.

   sideband-all
Instruct the server to send the whole response multiplexed, not just
the packfile section. All non-flush and non-delim PKT-LINE in the
response (not only in the packfile section) will then start with a byte
indicating its sideband (1, 2, or 3), and the server may send "0005\2"
(a PKT-LINE of sideband 2 with no payload) as a keepalive packet.

output = *section
section = (acknowledgments | shallow-info | wanted-refs | packfile)
   (flush-pkt | delim-pkt)

acknowledgments = PKT-LINE("acknowledgments" LF)
    (nak | *ack)
    (ready)
ready = PKT-LINE("ready" LF)
nak = PKT-LINE("NAK" LF)
ack = PKT-LINE("ACK" SP obj-id LF)

shallow-info = PKT-LINE("shallow-info" LF)
 *PKT-LINE((shallow | unshallow) LF)
shallow = "shallow" SP obj-id
unshallow = "unshallow" SP obj-id

wanted-refs = PKT-LINE("wanted-refs" LF)
*PKT-LINE(wanted-ref LF)
wanted-ref = obj-id SP refname

packfile = PKT-LINE("packfile" LF)
    *PKT-LINE(%x01-03 *%x00-ff)

   acknowledgments section
* If the client determines that it is finished with negotiations
  by sending a "done" line, the acknowledgments sections MUST be
  omitted from the server's response.