( )⚙ D3242 wireproto: define and implement HTTP handshake to upgrade protocol

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Differential D3242

wireproto: define and implement HTTP handshake to upgrade protocol
ClosedPublic

Authored by indygreg on Apr 10 2018, 9:28 PM.

Details

Reviewers
durin42
Group Reviewers
hg-reviewers
Commits
rHG734515aca84d: wireproto: define and implement HTTP handshake to upgrade protocol
Summary

When clients connect to repositories over HTTP, they issue a request
to the well-known URL "?cmd=capabilities" to fetch the repository
capabilities. This is the handshake portion of the HTTP protocol.

This commit defines a mechanism to use that HTTP request to return
information about modern server features.

If a client sends an X-HgUpgrade-* header containing a list of
client-supported API names, the server responds with a response
containing information about available services. This includes
the normal capabilities string. So if the server doesn't support
any newer services, the client can easily fall back.

By advertising supported services from clients, server operators
can see and log what client support exists in the wild. This will
also help with debugging.

The response contains the base path to API services. We know there
are potential issues with the <repo>/api/ URL space conflicting with
hgwebdir and subrepos. By making the API URL dynamic from the
perspective of the client, the URL for APIs is not subject to backwards
compatibility concerns - at least as long as a ?cmd=capabilities request
is made.

We've also defined the `cbor` client capability for the X-HgProto-*
header. This MUST be sent in order to get the modern response from
"?cmd=capabilities". During implementation, I initially always sent
an application/mercurial-cbor response. However, the handshake
mechanism will be more future compatible if the client is in charge
of which formats to request. We already perform content negotiation
from X-HgProto-*, so keying off this for the capabilities response
feels appropriate.

In addition, I initially used application/cbor. However, it is
conceivable that a non-Mercurial server could serve application/cbor.
To rule out this possibility, I've invented a new media type that
is Mercurial specific and can't be confused for generic CBOR.

Diff Detail

Repository
rHG Mercurial
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

indygreg created this revision.Apr 10 2018, 9:28 PM
durin42 accepted this revision.Apr 11 2018, 12:52 PM
This revision is now accepted and ready to land.Apr 11 2018, 12:52 PM
Closed by commit rHG734515aca84d: wireproto: define and implement HTTP handshake to upgrade protocol (authored by indygreg). · Explain WhyApr 11 2018, 1:01 PM
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

Diff 8003

mercurial/debugcommands.py

from .node import ( from .node import (
bin, bin,
hex, hex,
nullhex, nullhex,
nullid, nullid,
nullrev, nullrev,
short, short,
) )
from .thirdparty import (
cbor,
)
from . import ( from . import (
bundle2, bundle2,
changegroup, changegroup,
cmdutil, cmdutil,
color, color,
context, context,
dagparser, dagparser,
dagutil, dagutil,
req = urlmod.urlreq.request(pycompat.strurl(url), body, headers) req = urlmod.urlreq.request(pycompat.strurl(url), body, headers)
# urllib.Request insists on using has_data() as a proxy for # urllib.Request insists on using has_data() as a proxy for
# determining the request method. Override that to use our # determining the request method. Override that to use our
# explicitly requested method. # explicitly requested method.
req.get_method = lambda: method req.get_method = lambda: method
try: try:
opener.open(req).read() res = opener.open(req)
body = res.read()
except util.urlerr.urlerror as e: except util.urlerr.urlerror as e:
e.read() e.read()
continue
if res.headers.get('Content-Type') == 'application/mercurial-cbor':
ui.write(_('cbor> %s\n') % stringutil.pprint(cbor.loads(body)))
elif action == 'close': elif action == 'close':
peer.close() peer.close()
elif action == 'readavailable': elif action == 'readavailable':
if not stdout or not stderr: if not stdout or not stderr:
raise error.Abort(_('readavailable not available on this peer')) raise error.Abort(_('readavailable not available on this peer'))
stdin.close() stdin.close()

mercurial/help/internals/wireprotocol.txt

============= =============
Handshake Handshake
--------- ---------
The client sends a ``capabilities`` command request (``?cmd=capabilities``) The client sends a ``capabilities`` command request (``?cmd=capabilities``)
as soon as HTTP requests may be issued. as soon as HTTP requests may be issued.
The server responds with a capabilities string, which the client parses to By default, the server responds with a version 1 capabilities string, which
learn about the server's abilities. the client parses to learn about the server's abilities. The ``Content-Type``
for this response is ``application/mercurial-0.1`` or
``application/mercurial-0.2`` depending on whether the client advertised
support for version ``0.2`` in its request. (Clients aren't supposed to
advertise support for ``0.2`` until the capabilities response indicates
the server's support for that media type. However, a client could
conceivably cache this metadata and issue the capabilities request in such
a way to elicit an ``application/mercurial-0.2`` response.)
Clients wishing to switch to a newer API service may send an
``X-HgUpgrade-<X>`` header containing a space-delimited list of API service
names the client is capable of speaking. The request MUST also include an
``X-HgProto-<X>`` header advertising a known serialization format for the
response. ``cbor`` is currently the only defined serialization format.
If the request contains these headers, the response ``Content-Type`` MAY
be for a different media type. e.g. ``application/mercurial-cbor`` if the
client advertises support for CBOR.
The response MUST be deserializable to a map with the following keys:
apibase
URL path to API services, relative to the repository root. e.g. ``api/``.
apis
A map of API service names to API descriptors. An API descriptor contains
more details about that API. In the case of the HTTP Version 2 Transport,
it will be the normal response to a ``capabilities`` command.
Only the services advertised by the client that are also available on
the server are advertised.
v1capabilities
The capabilities string that would be returned by a version 1 response.
The client can then inspect the server-advertised APIs and decide which
API to use, including continuing to use the HTTP Version 1 Transport.
HTTP Version 1 Transport HTTP Version 1 Transport
------------------------ ------------------------
Commands are issued as HTTP/1.0 or HTTP/1.1 requests. Commands are Commands are issued as HTTP/1.0 or HTTP/1.1 requests. Commands are
sent to the base URL of the repository with the command name sent in sent to the base URL of the repository with the command name sent in
the ``cmd`` query string parameter. e.g. the ``cmd`` query string parameter. e.g.
``https://example.com/repo?cmd=capabilities``. The HTTP method is ``GET`` ``https://example.com/repo?cmd=capabilities``. The HTTP method is ``GET``
format. e.g. ``zlib``. The remaining bytes are compressed according to that format. e.g. ``zlib``. The remaining bytes are compressed according to that
compression format. The decompressed data behaves the same as with compression format. The decompressed data behaves the same as with
``application/mercurial-0.1``. ``application/mercurial-0.1``.
The ``application/hg-error`` media type indicates a generic error occurred. The ``application/hg-error`` media type indicates a generic error occurred.
The content of the HTTP response body typically holds text describing the The content of the HTTP response body typically holds text describing the
error. error.
The ``application/mercurial-cbor`` media type indicates a CBOR payload
and should be interpreted as identical to ``application/cbor``.
Behavior of media types is further described in the ``Content Negotiation`` Behavior of media types is further described in the ``Content Negotiation``
section below. section below.
Clients should issue a ``User-Agent`` request header that identifies the client. Clients should issue a ``User-Agent`` request header that identifies the client.
The server should not use the ``User-Agent`` for feature detection. The server should not use the ``User-Agent`` for feature detection.
A command returning a ``string`` response issues a A command returning a ``string`` response issues a
``application/mercurial-0.*`` media type and the HTTP response body contains ``application/mercurial-0.*`` media type and the HTTP response body contains
0.1 0.1
Indicates the client supports receiving ``application/mercurial-0.1`` Indicates the client supports receiving ``application/mercurial-0.1``
responses. responses.
0.2 0.2
Indicates the client supports receiving ``application/mercurial-0.2`` Indicates the client supports receiving ``application/mercurial-0.2``
responses. responses.
cbor
Indicates the client supports receiving ``application/mercurial-cbor``
responses.
(Only intended to be used with version 2 transports.)
comp comp
Indicates compression formats the client can decode. Value is a list of Indicates compression formats the client can decode. Value is a list of
comma delimited strings identifying compression formats ordered from comma delimited strings identifying compression formats ordered from
most preferential to least preferential. e.g. ``comp=zstd,zlib,none``. most preferential to least preferential. e.g. ``comp=zstd,zlib,none``.
This parameter does not have an effect if only the ``0.1`` parameter This parameter does not have an effect if only the ``0.1`` parameter
is defined, as support for ``application/mercurial-0.2`` or greater is is defined, as support for ``application/mercurial-0.2`` or greater is
required to use arbitrary compression formats. required to use arbitrary compression formats.

mercurial/wireprotoserver.py

# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net> # Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
# Copyright 2005-2007 Matt Mackall <mpm@selenic.com> # Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
# #
# This software may be used and distributed according to the terms of the # This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version. # GNU General Public License version 2 or any later version.
from __future__ import absolute_import from __future__ import absolute_import
import contextlib import contextlib
import struct import struct
import sys import sys
import threading import threading
from .i18n import _ from .i18n import _
from .thirdparty import (
cbor,
)
from .thirdparty.zope import ( from .thirdparty.zope import (
interface as zi, interface as zi,
) )
from . import ( from . import (
encoding, encoding,
error, error,
hook, hook,
pycompat, pycompat,
res.headers[k] = v res.headers[k] = v
res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e)) res.status = hgwebcommon.statusmessage(e.code, pycompat.bytestr(e))
# TODO This response body assumes the failed command was # TODO This response body assumes the failed command was
# "unbundle." That assumption is not always valid. # "unbundle." That assumption is not always valid.
res.setbodybytes('0\n%s\n' % pycompat.bytestr(e)) res.setbodybytes('0\n%s\n' % pycompat.bytestr(e))
return True return True
def _availableapis(repo):
apis = set()
# Registered APIs are made available via config options of the name of
# the protocol.
for k, v in API_HANDLERS.items():
section, option = v['config']
if repo.ui.configbool(section, option):
apis.add(k)
return apis
def handlewsgiapirequest(rctx, req, res, checkperm): def handlewsgiapirequest(rctx, req, res, checkperm):
"""Handle requests to /api/*.""" """Handle requests to /api/*."""
assert req.dispatchparts[0] == b'api' assert req.dispatchparts[0] == b'api'
repo = rctx.repo repo = rctx.repo
# This whole URL space is experimental for now. But we want to # This whole URL space is experimental for now. But we want to
# reserve the URL space. So, 404 all URLs if the feature isn't enabled. # reserve the URL space. So, 404 all URLs if the feature isn't enabled.
if not repo.ui.configbool('experimental', 'web.apiserver'): if not repo.ui.configbool('experimental', 'web.apiserver'):
res.status = b'404 Not Found' res.status = b'404 Not Found'
res.headers[b'Content-Type'] = b'text/plain' res.headers[b'Content-Type'] = b'text/plain'
res.setbodybytes(_('Experimental API server endpoint not enabled')) res.setbodybytes(_('Experimental API server endpoint not enabled'))
return return
# The URL space is /api/<protocol>/*. The structure of URLs under varies # The URL space is /api/<protocol>/*. The structure of URLs under varies
# by <protocol>. # by <protocol>.
# Registered APIs are made available via config options of the name of availableapis = _availableapis(repo)
# the protocol.
availableapis = set()
for k, v in API_HANDLERS.items():
section, option = v['config']
if repo.ui.configbool(section, option):
availableapis.add(k)
# Requests to /api/ list available APIs. # Requests to /api/ list available APIs.
if req.dispatchparts == [b'api']: if req.dispatchparts == [b'api']:
res.status = b'200 OK' res.status = b'200 OK'
res.headers[b'Content-Type'] = b'text/plain' res.headers[b'Content-Type'] = b'text/plain'
lines = [_('APIs can be accessed at /api/<name>, where <name> can be ' lines = [_('APIs can be accessed at /api/<name>, where <name> can be '
'one of the following:\n')] 'one of the following:\n')]
if availableapis: if availableapis:
res.headers[b'Content-Type'] = b'text/plain' res.headers[b'Content-Type'] = b'text/plain'
res.setbodybytes(_('API %s not enabled\n') % proto) res.setbodybytes(_('API %s not enabled\n') % proto)
return return
API_HANDLERS[proto]['handler'](rctx, req, res, checkperm, API_HANDLERS[proto]['handler'](rctx, req, res, checkperm,
req.dispatchparts[2:]) req.dispatchparts[2:])
# Maps API name to metadata so custom API can be registered. # Maps API name to metadata so custom API can be registered.
# Keys are:
#
# config
# Config option that controls whether service is enabled.
# handler
# Callable receiving (rctx, req, res, checkperm, urlparts) that is called
# when a request to this API is received.
# apidescriptor
# Callable receiving (req, repo) that is called to obtain an API
# descriptor for this service. The response must be serializable to CBOR.
API_HANDLERS = { API_HANDLERS = {
wireprotov2server.HTTPV2: { wireprotov2server.HTTPV2: {
'config': ('experimental', 'web.api.http-v2'), 'config': ('experimental', 'web.api.http-v2'),
'handler': wireprotov2server.handlehttpv2request, 'handler': wireprotov2server.handlehttpv2request,
'apidescriptor': wireprotov2server.httpv2apidescriptor,
}, },
} }
def _httpresponsetype(ui, proto, prefer_uncompressed): def _httpresponsetype(ui, proto, prefer_uncompressed):
"""Determine the appropriate response type and compression settings. """Determine the appropriate response type and compression settings.
Returns a tuple of (mediatype, compengine, engineopts). Returns a tuple of (mediatype, compengine, engineopts).
""" """
# legacy protocol. # legacy protocol.
# Don't allow untrusted settings because disabling compression or # Don't allow untrusted settings because disabling compression or
# setting a very high compression level could lead to flooding # setting a very high compression level could lead to flooding
# the server's network or CPU. # the server's network or CPU.
opts = {'level': ui.configint('server', 'zliblevel')} opts = {'level': ui.configint('server', 'zliblevel')}
return HGTYPE, util.compengines['zlib'], opts return HGTYPE, util.compengines['zlib'], opts
def processcapabilitieshandshake(repo, req, res, proto):
"""Called during a ?cmd=capabilities request.
If the client is advertising support for a newer protocol, we send
a CBOR response with information about available services. If no
advertised services are available, we don't handle the request.
"""
# Fall back to old behavior unless the API server is enabled.
if not repo.ui.configbool('experimental', 'web.apiserver'):
return False
clientapis = decodevaluefromheaders(req, b'X-HgUpgrade')
protocaps = decodevaluefromheaders(req, b'X-HgProto')
if not clientapis or not protocaps:
return False
# We currently only support CBOR responses.
protocaps = set(protocaps.split(' '))
if b'cbor' not in protocaps:
return False
descriptors = {}
for api in sorted(set(clientapis.split()) & _availableapis(repo)):
handler = API_HANDLERS[api]
descriptorfn = handler.get('apidescriptor')
if not descriptorfn:
continue
descriptors[api] = descriptorfn(req, repo)
v1caps = wireproto.dispatch(repo, proto, 'capabilities')
assert isinstance(v1caps, wireprototypes.bytesresponse)
m = {
# TODO allow this to be configurable.
'apibase': 'api/',
'apis': descriptors,
'v1capabilities': v1caps.data,
}
res.status = b'200 OK'
res.headers[b'Content-Type'] = b'application/mercurial-cbor'
res.setbodybytes(cbor.dumps(m, canonical=True))
return True
def _callhttp(repo, req, res, proto, cmd): def _callhttp(repo, req, res, proto, cmd):
# Avoid cycle involving hg module. # Avoid cycle involving hg module.
from .hgweb import common as hgwebcommon from .hgweb import common as hgwebcommon
def genversion2(gen, engine, engineopts): def genversion2(gen, engine, engineopts):
# application/mercurial-0.2 always sends a payload header # application/mercurial-0.2 always sends a payload header
# identifying the compression engine. # identifying the compression engine.
name = engine.wireprotosupport().name name = engine.wireprotosupport().name
if not wireproto.commands.commandavailable(cmd, proto): if not wireproto.commands.commandavailable(cmd, proto):
setresponse(HTTP_OK, HGERRTYPE, setresponse(HTTP_OK, HGERRTYPE,
_('requested wire protocol command is not available over ' _('requested wire protocol command is not available over '
'HTTP')) 'HTTP'))
return return
proto.checkperm(wireproto.commands[cmd].permission) proto.checkperm(wireproto.commands[cmd].permission)
# Possibly handle a modern client wanting to switch protocols.
if (cmd == 'capabilities' and
processcapabilitieshandshake(repo, req, res, proto)):
return
rsp = wireproto.dispatch(repo, proto, cmd) rsp = wireproto.dispatch(repo, proto, cmd)
if isinstance(rsp, bytes): if isinstance(rsp, bytes):
setresponse(HTTP_OK, HGTYPE, bodybytes=rsp) setresponse(HTTP_OK, HGTYPE, bodybytes=rsp)
elif isinstance(rsp, wireprototypes.bytesresponse): elif isinstance(rsp, wireprototypes.bytesresponse):
setresponse(HTTP_OK, HGTYPE, bodybytes=rsp.data) setresponse(HTTP_OK, HGTYPE, bodybytes=rsp.data)
elif isinstance(rsp, wireprototypes.streamreslegacy): elif isinstance(rsp, wireprototypes.streamreslegacy):
setresponse(HTTP_OK, HGTYPE, bodygen=rsp.gen) setresponse(HTTP_OK, HGTYPE, bodygen=rsp.gen)

mercurial/wireprotov2server.py

raise NotImplementedError raise NotImplementedError
def addcapabilities(self, repo, caps): def addcapabilities(self, repo, caps):
return caps return caps
def checkperm(self, perm): def checkperm(self, perm):
raise NotImplementedError raise NotImplementedError
def httpv2apidescriptor(req, repo):
proto = httpv2protocolhandler(req, repo.ui)
return _capabilitiesv2(repo, proto)
def _capabilitiesv2(repo, proto): def _capabilitiesv2(repo, proto):
"""Obtain the set of capabilities for version 2 transports. """Obtain the set of capabilities for version 2 transports.
These capabilities are distinct from the capabilities for version 1 These capabilities are distinct from the capabilities for version 1
transports. transports.
""" """
compression = [] compression = []
for engine in wireproto.supportedcompengines(repo.ui, util.SERVERROLE): for engine in wireproto.supportedcompengines(repo.ui, util.SERVERROLE):

tests/test-wireproto-command-capabilities.t

$ . $TESTDIR/wireprotohelpers.sh $ . $TESTDIR/wireprotohelpers.sh
$ hg init server $ hg init server
$ enablehttpv2 server
$ hg -R server serve -p $HGPORT -d --pid-file hg.pid -E error.log $ hg -R server serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS $ cat hg.pid > $DAEMON_PIDS
capabilities request returns an array of capability strings A normal capabilities request is serviced for version 1
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 458\r\n
s> \r\n
s> batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
A proper request without the API server enabled returns the legacy response
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: foo
> x-hgproto-1: cbor
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: foo\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 458\r\n
s> \r\n
s> batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
Restart with just API server enabled. This enables serving the new format.
$ killdaemons.py
$ cat error.log
$ cat >> server/.hg/hgrc << EOF
> [experimental]
> web.apiserver = true
> EOF
$ hg -R server serve -p $HGPORT -d --pid-file hg.pid -E error.log
$ cat hg.pid > $DAEMON_PIDS
X-HgUpgrade-<N> without CBOR advertisement uses legacy response
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: foo bar
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgupgrade-1: foo bar\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 458\r\n
s> \r\n
s> batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
X-HgUpgrade-<N> without known serialization in X-HgProto-<N> uses legacy response
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: foo bar
> x-hgproto-1: some value
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgproto-1: some value\r\n
s> x-hgupgrade-1: foo bar\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 458\r\n
s> \r\n
s> batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
X-HgUpgrade-<N> + X-HgProto-<N> headers trigger new response format
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: foo bar
> x-hgproto-1: cbor
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: foo bar\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-cbor\r\n
s> Content-Length: 496\r\n
s> \r\n
s> \xa3Dapis\xa0GapibaseDapi/Nv1capabilitiesY\x01\xcabatch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
cbor> {b'apibase': b'api/', b'apis': {}, b'v1capabilities': b'batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash'}
Restart server to enable HTTPv2
$ killdaemons.py
$ enablehttpv2 server
$ hg -R server serve -p $HGPORT -d --pid-file hg.pid -E error.log
Only requested API services are returned
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: foo bar
> x-hgproto-1: cbor
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: foo bar\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-cbor\r\n
s> Content-Length: 496\r\n
s> \r\n
s> \xa3Dapis\xa0GapibaseDapi/Nv1capabilitiesY\x01\xcabatch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
cbor> {b'apibase': b'api/', b'apis': {}, b'v1capabilities': b'batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash'}
Request for HTTPv2 service returns information about it
$ sendhttpraw << EOF
> httprequest GET ?cmd=capabilities
> user-agent: test
> x-hgupgrade-1: exp-http-v2-0001 foo bar
> x-hgproto-1: cbor
> EOF
using raw connection to peer
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgproto-1: cbor\r\n
s> x-hgupgrade-1: exp-http-v2-0001 foo bar\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 OK\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-cbor\r\n
s> Content-Length: 879\r\n
s> \r\n
s> \xa3Dapis\xa1Pexp-http-v2-0001\xa2Hcommands\xa7Eheads\xa2Dargs\xa1Jpubliconly\xf4Kpermissions\x81DpullEknown\xa2Dargs\xa1Enodes\x81HdeadbeefKpermissions\x81DpullFlookup\xa2Dargs\xa1CkeyCfooKpermissions\x81DpullGpushkey\xa2Dargs\xa4CkeyCkeyCnewCnewColdColdInamespaceBnsKpermissions\x81DpushHlistkeys\xa2Dargs\xa1InamespaceBnsKpermissions\x81DpullIbranchmap\xa2Dargs\xa0Kpermissions\x81DpullLcapabilities\xa2Dargs\xa0Kpermissions\x81DpullKcompression\x82\xa1DnameDzstd\xa1DnameDzlibGapibaseDapi/Nv1capabilitiesY\x01\xcabatch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash
cbor> {b'apibase': b'api/', b'apis': {b'exp-http-v2-0001': {b'commands': {b'branchmap': {b'args': {}, b'permissions': [b'pull']}, b'capabilities': {b'args': {}, b'permissions': [b'pull']}, b'heads': {b'args': {b'publiconly': False}, b'permissions': [b'pull']}, b'known': {b'args': {b'nodes': [b'deadbeef']}, b'permissions': [b'pull']}, b'listkeys': {b'args': {b'namespace': b'ns'}, b'permissions': [b'pull']}, b'lookup': {b'args': {b'key': b'foo'}, b'permissions': [b'pull']}, b'pushkey': {b'args': {b'key': b'key', b'namespace': b'ns', b'new': b'new', b'old': b'old'}, b'permissions': [b'push']}}, b'compression': [{b'name': b'zstd'}, {b'name': b'zlib'}]}}, b'v1capabilities': b'batch branchmap $USUAL_BUNDLE2_CAPS_SERVER$ changegroupsubset compression=$BUNDLE2_COMPRESSIONS$ getbundle httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx known lookup pushkey streamreqs=generaldelta,revlogv1 unbundle=HG10GZ,HG10BZ,HG10UN unbundlehash'}
capabilities command returns expected info
$ sendhttpv2peer << EOF $ sendhttpv2peer << EOF
> command capabilities > command capabilities
> EOF > EOF
creating http peer for wire protocol version 2 creating http peer for wire protocol version 2
sending capabilities command sending capabilities command
s> POST /api/exp-http-v2-0001/ro/capabilities HTTP/1.1\r\n s> POST /api/exp-http-v2-0001/ro/capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n s> Accept-Encoding: identity\r\n