view tests/test-http-bad-server.t @ 37047:fddcb51b5084

wireproto: define permissions-based routing of HTTPv2 wire protocol

Now that we have a scaffolding for serving version 2 of the HTTP
protocol, let's start implementing it.

A good place to start is URL routing and basic request processing
semantics. We can focus on content types, capabilities detect, etc
later.

Version 2 of the HTTP wire protocol encodes the needed permissions
of the request in the URL path. The reasons for this are documented
in the added documentation. In short, a) it makes it really easy and
fail proof for server administrators to implement path-based
authentication and b) it will enable clients to realize very early in
a server exchange that authentication will be required to complete
the operation. This latter point avoids all kinds of complexity and
problems, like dealing with Expect: 100-continue and clients finding
out later during `hg push` that they need to provide authentication.
This will avoid the current badness where clients send a full bundle,
get an HTTP 403, provide authentication, then retransmit the bundle.

In order to implement command checking, we needed to implement a
protocol handler for the new wire protocol. Our handler is just
small enough to run the code we've implemented.

Tests for the defined functionality have been added.

I very much want to refactor the permissions checking code and define
a better response format. But this can be done later. Nothing is
covered by backwards compatibility at this point.

Differential Revision: https://phab.mercurial-scm.org/D2836

#require killdaemons serve zstd

Client version is embedded in HTTP request and is effectively dynamic. Pin the
version so behavior is deterministic.

  $ cat > fakeversion.py << EOF
  > from mercurial import util
  > util.version = lambda: '4.2'
  > EOF

  $ cat >> $HGRCPATH << EOF
  > [extensions]
  > fakeversion = `pwd`/fakeversion.py
  > [devel]
  > legacy.exchange = phases
  > EOF

  $ hg init server0
  $ cd server0
  $ touch foo
  $ hg -q commit -A -m initial

Also disable compression because zstd is optional and causes output to vary
and because debugging partial responses is hard when compression is involved

  $ cat > .hg/hgrc << EOF
  > [extensions]
  > badserver = $TESTDIR/badserverext.py
  > [server]
  > compressionengines = none
  > EOF

Failure to accept() socket should result in connection related error message

  $ hg serve --config badserver.closebeforeaccept=true -p $HGPORT -d --pid-file=hg.pid
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: $ECONNRESET$
  [255]

(The server exits on its own, but there is a race between that and starting a new server.
So ensure the process is dead.)

  $ killdaemons.py $DAEMON_PIDS

Failure immediately after accept() should yield connection related error message

  $ hg serve --config badserver.closeafteraccept=true -p $HGPORT -d --pid-file=hg.pid
  $ cat hg.pid > $DAEMON_PIDS

TODO: this usually outputs good results, but sometimes emits abort:
error: '' on FreeBSD and OS X.
What we ideally want are:

abort: error: $ECONNRESET$

The flakiness in this output was observable easily with
--runs-per-test=20 on macOS 10.12 during the freeze for 4.2.
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: * (glob)
  [255]

  $ killdaemons.py $DAEMON_PIDS

Failure to read all bytes in initial HTTP request should yield connection related error message

  $ hg serve --config badserver.closeafterrecvbytes=1 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: bad HTTP status line: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(1 from 65537) -> (1) G
  read limit reached; closing socket

  $ rm -f error.log

Same failure, but server reads full HTTP request line

  $ hg serve --config badserver.closeafterrecvbytes=40 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: bad HTTP status line: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(40 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(7 from -1) -> (7) Accept-
  read limit reached; closing socket

  $ rm -f error.log

Failure on subsequent HTTP request on the same socket (cmd?batch)

  $ hg serve --config badserver.closeafterrecvbytes=210 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: bad HTTP status line: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(210 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(177 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(150 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(115 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(9? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(4? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: $HTTP_DATE$\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 436\r\n
  write(2) -> \r\n
  write(436) -> lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(4? from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n (glob)
  readline(1? from -1) -> (1?) Accept-Encoding* (glob)
  read limit reached; closing socket
  readline(210 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(184 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(157 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(128 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(87 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(39 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(4 from -1) -> (4) host
  read limit reached; closing socket

  $ rm -f error.log

Failure to read getbundle HTTP request

  $ hg serve --config badserver.closeafterrecvbytes=304 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: error: bad HTTP status line: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(1 from -1) -> (1) x (?)
  readline(1 from -1) -> (1) x (?)
  readline(304 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(271 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(244 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(209 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(18? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(13? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: $HTTP_DATE$\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 436\r\n
  write(2) -> \r\n
  write(436) -> lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(13? from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n (glob)
  readline(1?? from -1) -> (27) Accept-Encoding: identity\r\n (glob)
  readline(8? from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n (glob)
  readline(5? from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n (glob)
  readline(1? from -1) -> (1?) x-hgproto-1:* (glob)
  read limit reached; closing socket
  readline(304 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(278 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(251 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(222 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(181 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(133 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(98 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(7? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(2? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: $HTTP_DATE$\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(20) -> Content-Length: 42\r\n
  write(2) -> \r\n
  write(42) -> 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(2? from 65537) -> (2?) GET /?cmd=getbundle HTTP* (glob)
  read limit reached; closing socket
  readline(304 from 65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(274 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(247 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(218 from -1) -> (218) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtag
  read limit reached; closing socket

  $ rm -f error.log

Now do a variation using POST to send arguments

  $ hg serve --config experimental.httppostargs=true --config badserver.closeafterrecvbytes=315 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: bad HTTP status line: ''
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(315 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(282 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(255 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(220 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(19? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(14? from -1) -> (2) \r\n (glob)
  write(36) -> HTTP/1.1 200 Script output follows\r\n
  write(23) -> Server: badhttpserver\r\n
  write(37) -> Date: $HTTP_DATE$\r\n
  write(41) -> Content-Type: application/mercurial-0.1\r\n
  write(21) -> Content-Length: 449\r\n
  write(2) -> \r\n
  write(449) -> lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httppostargs httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline\(14[67] from 65537\) -> \(2[67]\) POST /\?cmd=batch HTTP/1.1\\r\\n (re)
  readline\(1(19|20) from -1\) -> \(27\) Accept-Encoding: identity\\r\\n (re)
  readline(9? from -1) -> (41) content-type: application/mercurial-0.1\r\n (glob)
  readline(5? from -1) -> (19) vary: X-HgProto-1\r\n (glob)
  readline(3? from -1) -> (19) x-hgargs-post: 28\r\n (glob)
  readline(1? from -1) -> (1?) x-hgproto-1: * (glob)
  read limit reached; closing socket
  readline(315 from 65537) -> (27) POST /?cmd=batch HTTP/1.1\r\n
  readline(288 from -1) -> (27) Accept-Encoding: identity\r\n
  readline(261 from -1) -> (41) content-type: application/mercurial-0.1\r\n
  readline(220 from -1) -> (19) vary: X-HgProto-1\r\n
  readline(201 from -1) -> (19) x-hgargs-post: 28\r\n
  readline(182 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(134 from -1) -> (35) accept: application/mercurial-0.1\r\n
  readline(99 from -1) -> (20) content-length: 28\r\n
  readline(79 from -1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(5? from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n (glob)
  readline(? from -1) -> (2) \r\n (glob)
  read(? from 28) -> (?) cmds=* (glob)
  read limit reached, closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Now move on to partial server responses

Server sends a single character from the HTTP response line

  $ hg serve --config badserver.closeaftersendbytes=1 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: error: bad HTTP status line: H
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(1 from 36) -> (0) H
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends an incomplete capabilities response body

  $ hg serve --config badserver.closeaftersendbytes=180 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  abort: HTTP request error (incomplete response; expected 416 bytes got 20)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (144) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (121) Server: badhttpserver\r\n
  write(37 from 37) -> (84) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (43) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (22) Content-Length: 436\r\n
  write(2 from 2) -> (20) \r\n
  write(20 from 436) -> (0) lookup branchmap pus
  write limit reached; closing socket

  $ rm -f error.log

Server sends incomplete headers for batch request

  $ hg serve --config badserver.closeaftersendbytes=714 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO this output is horrible

  $ hg clone http://localhost:$HGPORT/ clone
  abort: 'http://localhost:$HGPORT/' does not appear to be an hg repository:
  ---%<--- (applicat)
  
  ---%<---
  !
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (678) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (655) Server: badhttpserver\r\n
  write(37 from 37) -> (618) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (577) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (556) Content-Length: 436\r\n
  write(2 from 2) -> (554) \r\n
  write(436 from 436) -> (118) lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (82) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (59) Server: badhttpserver\r\n
  write(37 from 37) -> (22) Date: $HTTP_DATE$\r\n
  write(22 from 41) -> (0) Content-Type: applicat
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends an incomplete HTTP response body to batch request

  $ hg serve --config badserver.closeaftersendbytes=779 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO client spews a stack due to uncaught ValueError in batch.results()
#if no-chg
  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
  [1]
#else
  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
  [255]
#endif

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (743) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (720) Server: badhttpserver\r\n
  write(37 from 37) -> (683) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (642) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (621) Content-Length: 436\r\n
  write(2 from 2) -> (619) \r\n
  write(436 from 436) -> (183) lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (147) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (124) Server: badhttpserver\r\n
  write(37 from 37) -> (87) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (46) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (26) Content-Length: 42\r\n
  write(2 from 2) -> (24) \r\n
  write(24 from 42) -> (0) 96ee1d7354c4ad7372047672
  write limit reached; closing socket

  $ rm -f error.log

Server sends incomplete headers for getbundle response

  $ hg serve --config badserver.closeaftersendbytes=926 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

TODO this output is terrible

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: 'http://localhost:$HGPORT/' does not appear to be an hg repository:
  ---%<--- (application/mercuri)
  
  ---%<---
  !
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (890) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (867) Server: badhttpserver\r\n
  write(37 from 37) -> (830) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (789) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (768) Content-Length: 436\r\n
  write(2 from 2) -> (766) \r\n
  write(436 from 436) -> (330) lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (294) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (271) Server: badhttpserver\r\n
  write(37 from 37) -> (234) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (193) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (173) Content-Length: 42\r\n
  write(2 from 2) -> (171) \r\n
  write(42 from 42) -> (129) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (461) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache%250Astream%253Dv2&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (93) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (70) Server: badhttpserver\r\n
  write(37 from 37) -> (33) Date: $HTTP_DATE$\r\n
  write(33 from 41) -> (0) Content-Type: application/mercuri
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends empty HTTP body for getbundle

  $ hg serve --config badserver.closeaftersendbytes=964 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (928) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (905) Server: badhttpserver\r\n
  write(37 from 37) -> (868) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (827) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (806) Content-Length: 436\r\n
  write(2 from 2) -> (804) \r\n
  write(436 from 436) -> (368) lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (332) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (309) Server: badhttpserver\r\n
  write(37 from 37) -> (272) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (231) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (211) Content-Length: 42\r\n
  write(2 from 2) -> (209) \r\n
  write(42 from 42) -> (167) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (461) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache%250Astream%253Dv2&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (131) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (108) Server: badhttpserver\r\n
  write(37 from 37) -> (71) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (30) Content-Type: application/mercurial-0.2\r\n
  write(28 from 28) -> (2) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (0) \r\n
  write limit reached; closing socket
  write(36) -> HTTP/1.1 500 Internal Server Error\r\n

  $ rm -f error.log

Server sends partial compression string

  $ hg serve --config badserver.closeaftersendbytes=988 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ cat error.log
  readline(65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (952) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (929) Server: badhttpserver\r\n
  write(37 from 37) -> (892) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (851) Content-Type: application/mercurial-0.1\r\n
  write(21 from 21) -> (830) Content-Length: 436\r\n
  write(2 from 2) -> (828) \r\n
  write(436 from 436) -> (392) lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 bundle2=HG20%0Abookmarks%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps%0Arev-branch-cache unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (356) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (333) Server: badhttpserver\r\n
  write(37 from 37) -> (296) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (255) Content-Type: application/mercurial-0.1\r\n
  write(20 from 20) -> (235) Content-Length: 42\r\n
  write(2 from 2) -> (233) \r\n
  write(42 from 42) -> (191) 96ee1d7354c4ad7372047672c36a1f561e3a6a4c\n;
  readline(65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
  readline(-1) -> (27) Accept-Encoding: identity\r\n
  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
  readline(-1) -> (461) x-hgarg-1: bookmarks=1&bundlecaps=HG20%2Cbundle2%3DHG20%250Abookmarks%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps%250Arev-branch-cache%250Astream%253Dv2&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
  readline(-1) -> (2?) host: localhost:$HGPORT\r\n (glob)
  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
  readline(-1) -> (2) \r\n
  write(36 from 36) -> (155) HTTP/1.1 200 Script output follows\r\n
  write(23 from 23) -> (132) Server: badhttpserver\r\n
  write(37 from 37) -> (95) Date: $HTTP_DATE$\r\n
  write(41 from 41) -> (54) Content-Type: application/mercurial-0.2\r\n
  write(28 from 28) -> (26) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (24) \r\n
  write(6 from 6) -> (18) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (9) 4\r\nnone\r\n
  write(9 from 9) -> (0) 4\r\nHG20\r\n
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server sends partial bundle2 header magic

  $ hg serve --config badserver.closeaftersendbytes=985 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response; expected 1 bytes got 3)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -7 error.log
  write(28 from 28) -> (23) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (21) \r\n
  write(6 from 6) -> (15) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (6) 4\r\nnone\r\n
  write(6 from 9) -> (0) 4\r\nHG2
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server sends incomplete bundle2 stream params length

  $ hg serve --config badserver.closeaftersendbytes=994 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response; expected 1 bytes got 3)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -8 error.log
  write(28 from 28) -> (32) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (30) \r\n
  write(6 from 6) -> (24) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (15) 4\r\nnone\r\n
  write(9 from 9) -> (6) 4\r\nHG20\r\n
  write(6 from 9) -> (0) 4\\r\\n\x00\x00\x00 (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Servers stops after bundle2 stream params header

  $ hg serve --config badserver.closeaftersendbytes=997 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -8 error.log
  write(28 from 28) -> (35) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (33) \r\n
  write(6 from 6) -> (27) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (18) 4\r\nnone\r\n
  write(9 from 9) -> (9) 4\r\nHG20\r\n
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after bundle2 part header length

  $ hg serve --config badserver.closeaftersendbytes=1006 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -9 error.log
  write(28 from 28) -> (44) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (42) \r\n
  write(6 from 6) -> (36) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (27) 4\r\nnone\r\n
  write(9 from 9) -> (18) 4\r\nHG20\r\n
  write(9 from 9) -> (9) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after bundle2 part header

  $ hg serve --config badserver.closeaftersendbytes=1053 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -10 error.log
  write(28 from 28) -> (91) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (89) \r\n
  write(6 from 6) -> (83) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (74) 4\r\nnone\r\n
  write(9 from 9) -> (65) 4\r\nHG20\r\n
  write(9 from 9) -> (56) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (47) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (0) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops after bundle2 part payload chunk size

  $ hg serve --config badserver.closeaftersendbytes=1074 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response; expected 459 bytes got 7)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -11 error.log
  write(2 from 2) -> (110) \r\n
  write(6 from 6) -> (104) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (95) 4\r\nnone\r\n
  write(9 from 9) -> (86) 4\r\nHG20\r\n
  write(9 from 9) -> (77) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (68) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (21) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (12) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(12 from 473) -> (0) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1d (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending in middle of bundle2 payload chunk

  $ hg serve --config badserver.closeaftersendbytes=1535 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -12 error.log
  write(28 from 28) -> (573) Transfer-Encoding: chunked\r\n
  write(2 from 2) -> (571) \r\n
  write(6 from 6) -> (565) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (556) 4\r\nnone\r\n
  write(9 from 9) -> (547) 4\r\nHG20\r\n
  write(9 from 9) -> (538) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (529) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (482) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (473) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (0) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after 0 length payload chunk size

  $ hg serve --config badserver.closeaftersendbytes=1566 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  transaction abort!
  rollback completed
  abort: HTTP request error (incomplete response; expected 23 bytes got 9)
  (this may be an intermittent network failure; if the error persists, consider contacting the network or server operator)
  [255]

  $ killdaemons.py $DAEMON_PIDS

  $ tail -13 error.log
  write(6 from 6) -> (596) 1\\r\\n\x04\\r\\n (esc)
  write(9 from 9) -> (587) 4\r\nnone\r\n
  write(9 from 9) -> (578) 4\r\nHG20\r\n
  write(9 from 9) -> (569) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (560) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (513) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (504) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (31) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (22) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (13) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
  write(13 from 38) -> (0) 20\\r\\n\x08LISTKEYS (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log

Server stops sending after 0 part bundle part header (indicating end of bundle2 payload)
This is before the 0 size chunked transfer part that signals end of HTTP response.

#  $ hg serve --config badserver.closeaftersendbytes=1741 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ hg serve --config badserver.closeaftersendbytes=1848 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets 96ee1d7354c4
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ killdaemons.py $DAEMON_PIDS

  $ tail -22 error.log
  write(9 from 9) -> (851) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (842) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (795) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (786) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (313) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (304) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (295) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
  write(38 from 38) -> (257) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
  write(9 from 9) -> (248) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
  write(64 from 64) -> (184) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
  write(9 from 9) -> (175) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (166) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
  write(41 from 41) -> (125) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
  write(9 from 9) -> (116) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (107) 4\\r\\n\x00\x00\x00\x1d\\r\\n (esc)
  write(35 from 35) -> (72) 1d\\r\\n\x16CACHE:REV-BRANCH-CACHE\x00\x00\x00\x03\x00\x00\\r\\n (esc)
  write(9 from 9) -> (63) 4\\r\\n\x00\x00\x00'\\r\\n (esc)
  write(45 from 45) -> (18) 27\\r\\n\x00\x00\x00\x07\x00\x00\x00\x01\x00\x00\x00\x00default\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\\r\\n (esc)
  write(9 from 9) -> (9) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log
  $ rm -rf clone

Server sends a size 0 chunked-transfer size without terminating \r\n

  $ hg serve --config badserver.closeaftersendbytes=1851 -p $HGPORT -d --pid-file=hg.pid -E error.log
  $ cat hg.pid > $DAEMON_PIDS

  $ hg clone http://localhost:$HGPORT/ clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets 96ee1d7354c4
  updating to branch default
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ killdaemons.py $DAEMON_PIDS

  $ tail -23 error.log
  write(9 from 9) -> (854) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (845) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
  write(47 from 47) -> (798) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
  write(9 from 9) -> (789) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
  write(473 from 473) -> (316) 1d2\\r\\n\x00\x00\x00\xb2\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00>6a3df4de388f3c4f8e28f4f9a814299a3cbb5f50\\ntest\\n0 0\\nfoo\\n\\ninitial\x00\x00\x00\x00\x00\x00\x00\xa1j=\xf4\xde8\x8f<O\x8e(\xf4\xf9\xa8\x14)\x9a<\xbb_P\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00-foo\x00b80de5d138758541c5f05265ad144ab9fa86d1db\\n\x00\x00\x00\x00\x00\x00\x00\x07foo\x00\x00\x00h\xb8\\r\xe5\xd18u\x85A\xc5\xf0Re\xad\x14J\xb9\xfa\x86\xd1\xdb\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\x00\x00\x00\x00\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (307) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (298) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
  write(38 from 38) -> (260) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
  write(9 from 9) -> (251) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
  write(64 from 64) -> (187) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
  write(9 from 9) -> (178) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (169) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
  write(41 from 41) -> (128) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\r\\n (esc)
  write(9 from 9) -> (119) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (110) 4\\r\\n\x00\x00\x00\x1d\\r\\n (esc)
  write(35 from 35) -> (75) 1d\\r\\n\x16CACHE:REV-BRANCH-CACHE\x00\x00\x00\x03\x00\x00\\r\\n (esc)
  write(9 from 9) -> (66) 4\\r\\n\x00\x00\x00'\\r\\n (esc)
  write(45 from 45) -> (21) 27\\r\\n\x00\x00\x00\x07\x00\x00\x00\x01\x00\x00\x00\x00default\x96\xee\x1dsT\xc4\xadsr\x04vr\xc3j\x1fV\x1e:jL\\r\\n (esc)
  write(9 from 9) -> (12) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(9 from 9) -> (3) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
  write(3 from 5) -> (0) 0\r\n
  write limit reached; closing socket
  write(27) -> 15\r\nInternal Server Error\r\n

  $ rm -f error.log
  $ rm -rf clone