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tests: add tests for poorly behaving HTTP server
authorGregory Szorc <gregory.szorc@gmail.com>
Thu, 13 Apr 2017 22:19:28 -0700
changeset 32001 c85f19c66e8d
parent 32000 511a62669f1b
child 32002 bf855efe5664
tests: add tests for poorly behaving HTTP server I've spent several hours over the past few weeks investigating networking failures involving hg.mozilla.org. As part of this, it has become clear that the Mercurial client's error handling when it encounters network failures is far from robust. To prove this is true, I've devised a battery of tests simulating various network failures, notably premature connection closes. To achieve this, I've implemented an extension that monkeypatches the built-in HTTP server and hooks in at the socket level and allows various events to occur based on config options. For example, you can refuse to accept() a client socket or you can close() the socket after N bytes have been sent or received. The latter effectively simulates an unexpected connection drop (and these occur all the time in the real world). The new test file launches servers exhibiting various "bad" behaviors and points a client at them. As the many TODO comments in the test call attention to, Mercurial often displays unhelpful errors when network-related failures occur. This makes it difficult for users to understand what's going on and difficult for server administrators to pinpoint root causes without packet tracing. Upcoming patches will attempt to fix these error handling deficiencies.
tests/badserverext.py file | annotate | diff | comparison | revisions
tests/test-check-code.t file | annotate | diff | comparison | revisions
tests/test-http-bad-server.t file | annotate | diff | comparison | revisions 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/badserverext.py	Thu Apr 13 22:19:28 2017 -0700
@@ -0,0 +1,269 @@
+# badserverext.py - Extension making servers behave badly
+#
+# Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+# no-check-code
+
+"""Extension to make servers behave badly.
+
+This extension is useful for testing Mercurial behavior when various network
+events occur.
+
+Various config options in the [badserver] section influence behavior:
+
+closebeforeaccept
+   If true, close() the server socket when a new connection arrives before
+   accept() is called. The server will then exit.
+
+closeafteraccept
+   If true, the server will close() the client socket immediately after
+   accept().
+
+closeafterrecvbytes
+   If defined, close the client socket after receiving this many bytes.
+
+closeaftersendbytes
+   If defined, close the client socket after sending this many bytes.
+"""
+
+from __future__ import absolute_import
+
+import socket
+
+from mercurial.hgweb import (
+    server,
+)
+
+# We can't adjust __class__ on a socket instance. So we define a proxy type.
+class socketproxy(object):
+    __slots__ = (
+        '_orig',
+        '_logfp',
+        '_closeafterrecvbytes',
+        '_closeaftersendbytes',
+    )
+
+    def __init__(self, obj, logfp, closeafterrecvbytes=0,
+                 closeaftersendbytes=0):
+        object.__setattr__(self, '_orig', obj)
+        object.__setattr__(self, '_logfp', logfp)
+        object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes)
+        object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes)
+
+    def __getattribute__(self, name):
+        if name in ('makefile',):
+            return object.__getattribute__(self, name)
+
+        return getattr(object.__getattribute__(self, '_orig'), name)
+
+    def __delattr__(self, name):
+        delattr(object.__getattribute__(self, '_orig'), name)
+
+    def __setattr__(self, name, value):
+        setattr(object.__getattribute__(self, '_orig'), name, value)
+
+    def makefile(self, mode, bufsize):
+        f = object.__getattribute__(self, '_orig').makefile(mode, bufsize)
+
+        logfp = object.__getattribute__(self, '_logfp')
+        closeafterrecvbytes = object.__getattribute__(self,
+                                                      '_closeafterrecvbytes')
+        closeaftersendbytes = object.__getattribute__(self,
+                                                      '_closeaftersendbytes')
+
+        return fileobjectproxy(f, logfp,
+                               closeafterrecvbytes=closeafterrecvbytes,
+                               closeaftersendbytes=closeaftersendbytes)
+
+# We can't adjust __class__ on socket._fileobject, so define a proxy.
+class fileobjectproxy(object):
+    __slots__ = (
+        '_orig',
+        '_logfp',
+        '_closeafterrecvbytes',
+        '_closeaftersendbytes',
+    )
+
+    def __init__(self, obj, logfp, closeafterrecvbytes=0,
+                 closeaftersendbytes=0):
+        object.__setattr__(self, '_orig', obj)
+        object.__setattr__(self, '_logfp', logfp)
+        object.__setattr__(self, '_closeafterrecvbytes', closeafterrecvbytes)
+        object.__setattr__(self, '_closeaftersendbytes', closeaftersendbytes)
+
+    def __getattribute__(self, name):
+        if name in ('read', 'readline', 'write', '_writelog'):
+            return object.__getattribute__(self, name)
+
+        return getattr(object.__getattribute__(self, '_orig'), name)
+
+    def __delattr__(self, name):
+        delattr(object.__getattribute__(self, '_orig'), name)
+
+    def __setattr__(self, name, value):
+        setattr(object.__getattribute__(self, '_orig'), name, value)
+
+    def _writelog(self, msg):
+        msg = msg.replace('\r', '\\r').replace('\n', '\\n')
+
+        object.__getattribute__(self, '_logfp').write(msg)
+        object.__getattribute__(self, '_logfp').write('\n')
+
+    def read(self, size=-1):
+        remaining = object.__getattribute__(self, '_closeafterrecvbytes')
+
+        # No read limit. Call original function.
+        if not remaining:
+            result = object.__getattribute__(self, '_orig').read(size)
+            self._writelog('read(%d) -> (%d) (%s) %s' % (size,
+                                                           len(result),
+                                                           result))
+            return result
+
+        origsize = size
+
+        if size < 0:
+            size = remaining
+        else:
+            size = min(remaining, size)
+
+        result = object.__getattribute__(self, '_orig').read(size)
+        remaining -= len(result)
+
+        self._writelog('read(%d from %d) -> (%d) %s' % (
+            size, origsize, len(result), result))
+
+        object.__setattr__(self, '_closeafterrecvbytes', remaining)
+
+        if remaining <= 0:
+            self._writelog('read limit reached, closing socket')
+            self._sock.close()
+            # This is the easiest way to abort the current request.
+            raise Exception('connection closed after receiving N bytes')
+
+        return result
+
+    def readline(self, size=-1):
+        remaining = object.__getattribute__(self, '_closeafterrecvbytes')
+
+        # No read limit. Call original function.
+        if not remaining:
+            result = object.__getattribute__(self, '_orig').readline(size)
+            self._writelog('readline(%d) -> (%d) %s' % (
+                size, len(result), result))
+            return result
+
+        origsize = size
+
+        if size < 0:
+            size = remaining
+        else:
+            size = min(remaining, size)
+
+        result = object.__getattribute__(self, '_orig').readline(size)
+        remaining -= len(result)
+
+        self._writelog('readline(%d from %d) -> (%d) %s' % (
+            size, origsize, len(result), result))
+
+        object.__setattr__(self, '_closeafterrecvbytes', remaining)
+
+        if remaining <= 0:
+            self._writelog('read limit reached; closing socket')
+            self._sock.close()
+            # This is the easiest way to abort the current request.
+            raise Exception('connection closed after receiving N bytes')
+
+        return result
+
+    def write(self, data):
+        remaining = object.__getattribute__(self, '_closeaftersendbytes')
+
+        # No byte limit on this operation. Call original function.
+        if not remaining:
+            self._writelog('write(%d) -> %s' % (len(data), data))
+            result = object.__getattribute__(self, '_orig').write(data)
+            return result
+
+        if len(data) > remaining:
+            newdata = data[0:remaining]
+        else:
+            newdata = data
+
+        remaining -= len(newdata)
+
+        self._writelog('write(%d from %d) -> (%d) %s' % (
+            len(newdata), len(data), remaining, newdata))
+
+        result = object.__getattribute__(self, '_orig').write(newdata)
+
+        object.__setattr__(self, '_closeaftersendbytes', remaining)
+
+        if remaining <= 0:
+            self._writelog('write limit reached; closing socket')
+            self._sock.close()
+            raise Exception('connection closed after sending N bytes')
+
+        return result
+
+def extsetup(ui):
+    # Change the base HTTP server class so various events can be performed.
+    # See SocketServer.BaseServer for how the specially named methods work.
+    class badserver(server.MercurialHTTPServer):
+        def __init__(self, ui, *args, **kwargs):
+            self._ui = ui
+            super(badserver, self).__init__(ui, *args, **kwargs)
+
+            # Need to inherit object so super() works.
+            class badrequesthandler(self.RequestHandlerClass, object):
+                def send_header(self, name, value):
+                    # Make headers deterministic to facilitate testing.
+                    if name.lower() == 'date':
+                        value = 'Fri, 14 Apr 2017 00:00:00 GMT'
+                    elif name.lower() == 'server':
+                        value = 'badhttpserver'
+
+                    return super(badrequesthandler, self).send_header(name,
+                                                                      value)
+
+            self.RequestHandlerClass = badrequesthandler
+
+        # Called to accept() a pending socket.
+        def get_request(self):
+            if self._ui.configbool('badserver', 'closebeforeaccept'):
+                self.socket.close()
+
+                # Tells the server to stop processing more requests.
+                self.__shutdown_request = True
+
+                # Simulate failure to stop processing this request.
+                raise socket.error('close before accept')
+
+            if self._ui.configbool('badserver', 'closeafteraccept'):
+                request, client_address = super(badserver, self).get_request()
+                request.close()
+                raise socket.error('close after accept')
+
+            return super(badserver, self).get_request()
+
+        # Does heavy lifting of processing a request. Invokes
+        # self.finish_request() which calls self.RequestHandlerClass() which
+        # is a hgweb.server._httprequesthandler.
+        def process_request(self, socket, address):
+            # Wrap socket in a proxy if we need to count bytes.
+            closeafterrecvbytes = self._ui.configint('badserver',
+                                                     'closeafterrecvbytes', 0)
+            closeaftersendbytes = self._ui.configint('badserver',
+                                                     'closeaftersendbytes', 0)
+
+            if closeafterrecvbytes or closeaftersendbytes:
+                socket = socketproxy(socket, self.errorlog,
+                                     closeafterrecvbytes=closeafterrecvbytes,
+                                     closeaftersendbytes=closeaftersendbytes)
+
+            return super(badserver, self).process_request(socket, address)
+
+    server.MercurialHTTPServer = badserver
--- a/tests/test-check-code.t	Thu Apr 13 22:12:04 2017 -0700
+++ b/tests/test-check-code.t	Thu Apr 13 22:19:28 2017 -0700
@@ -40,6 +40,7 @@
    >     policy = os.environ.get('HGMODULEPOLICY', policy)
    use encoding.environ instead (py3)
   Skipping mercurial/statprof.py it has no-che?k-code (glob)
+  Skipping tests/badserverext.py it has no-che?k-code (glob)
   [1]
 
 @commands in debugcommands.py should be in alphabetical order.
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-http-bad-server.t	Thu Apr 13 22:19:28 2017 -0700
@@ -0,0 +1,896 @@
+#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
+  > 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 --config badserver.closebeforeaccept=true serve -p $HGPORT -d --pid-file=hg.pid
+  $ cat hg.pid > $DAEMON_PIDS
+
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: Connection reset by peer
+  [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 --config badserver.closeafteraccept=true serve -p $HGPORT -d --pid-file=hg.pid
+  $ cat hg.pid > $DAEMON_PIDS
+
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: Connection reset by peer
+  [255]
+
+  $ killdaemons.py $DAEMON_PIDS
+
+Failure to read all bytes in initial HTTP request should yield connection related error message
+
+  $ hg --config badserver.closeafterrecvbytes=1 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+TODO this error message is not very good
+
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: ''
+  [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 --config badserver.closeafterrecvbytes=40 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: ''
+  [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 --config badserver.closeafterrecvbytes=210 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: ''
+  [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) -> (8) vary: \r\n
+  readline(142 from -1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(107 from -1) -> (23) host: localhost:$HGPORT\r\n
+  readline(84 from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(35 from -1) -> (2) \r\n
+  write(36) -> HTTP/1.1 200 Script output follows\r\n
+  write(23) -> Server: badhttpserver\r\n
+  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41) -> Content-Type: application/mercurial-0.1\r\n
+  write(21) -> Content-Length: 405\r\n
+  write(2) -> \r\n
+  write(405) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(33 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(7 from -1) -> (7) Accept-
+  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=zstd,zlib,none,bzip2\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 --config badserver.closeafterrecvbytes=300 serve -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: ''
+  [255]
+
+  $ killdaemons.py $DAEMON_PIDS
+
+  $ cat error.log
+  readline(300 from 65537) -> (33) GET /?cmd=capabilities HTTP/1.1\r\n
+  readline(267 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(240 from -1) -> (8) vary: \r\n
+  readline(232 from -1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(197 from -1) -> (23) host: localhost:$HGPORT\r\n
+  readline(174 from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(125 from -1) -> (2) \r\n
+  write(36) -> HTTP/1.1 200 Script output follows\r\n
+  write(23) -> Server: badhttpserver\r\n
+  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41) -> Content-Type: application/mercurial-0.1\r\n
+  write(21) -> Content-Length: 405\r\n
+  write(2) -> \r\n
+  write(405) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(123 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(97 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(70 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(41 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  read limit reached; closing socket
+  readline(300 from 65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(274 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(247 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(218 from -1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(177 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(129 from -1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(94 from -1) -> (23) host: localhost:$HGPORT\r\n
+  readline(71 from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(22 from -1) -> (2) \r\n
+  write(36) -> HTTP/1.1 200 Script output follows\r\n
+  write(23) -> Server: badhttpserver\r\n
+  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\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(20 from 65537) -> (20) GET /?cmd=getbundle 
+  read limit reached; closing socket
+  readline(300 from 65537) -> (30) GET /?cmd=getbundle HTTP/1.1\r\n
+  readline(270 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(243 from -1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(214 from -1) -> (214) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%2
+  read limit reached; closing socket
+
+  $ rm -f error.log
+
+Now do a variation using POST to send arguments
+
+  $ hg --config experimental.httppostargs=true --config badserver.closeafterrecvbytes=315 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: ''
+  [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) -> (8) vary: \r\n
+  readline(247 from -1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(212 from -1) -> (23) host: localhost:$HGPORT\r\n
+  readline(189 from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(140 from -1) -> (2) \r\n
+  write(36) -> HTTP/1.1 200 Script output follows\r\n
+  write(23) -> Server: badhttpserver\r\n
+  write(37) -> Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41) -> Content-Type: application/mercurial-0.1\r\n
+  write(21) -> Content-Length: 418\r\n
+  write(2) -> \r\n
+  write(418) -> lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httppostargs httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(138 from 65537) -> (27) POST /?cmd=batch HTTP/1.1\r\n
+  readline(111 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(84 from -1) -> (41) content-type: application/mercurial-0.1\r\n
+  readline(43 from -1) -> (19) vary: X-HgProto-1\r\n
+  readline(24 from -1) -> (19) x-hgargs-post: 28\r\n
+  readline(5 from -1) -> (5) x-hgp
+  read limit reached; closing socket
+  readline(315 from 65537) -> (27) POST /?cmd=batch HTTP/1.1\r\n
+  readline(288 from -1) -> (27) Accept-Encoding: identity\r\n
+  readline(261 from -1) -> (41) content-type: application/mercurial-0.1\r\n
+  readline(220 from -1) -> (19) vary: X-HgProto-1\r\n
+  readline(201 from -1) -> (19) x-hgargs-post: 28\r\n
+  readline(182 from -1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(134 from -1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(99 from -1) -> (20) content-length: 28\r\n
+  readline(79 from -1) -> (23) host: localhost:$HGPORT\r\n
+  readline(56 from -1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(7 from -1) -> (2) \r\n
+  read(5 from 28) -> (5) cmds=
+  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 --config badserver.closeaftersendbytes=1 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+  $ hg clone http://localhost:$HGPORT/ clone
+  abort: error: 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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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 --config badserver.closeaftersendbytes=180 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+TODO client spews a stack due to uncaught httplib.IncompleteRead
+
+  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
+  [1]
+
+  $ 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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (43) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (22) Content-Length: 405\r\n
+  write(2 from 2) -> (20) \r\n
+  write(20 from 405) -> (0) lookup changegroupsu
+  write limit reached; closing socket
+
+  $ rm -f error.log
+
+Server sends incomplete headers for batch request
+
+  $ hg --config badserver.closeaftersendbytes=695 serve -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:
+  ---%<--- (application/mercuria)
+  
+  ---%<---
+  !
+  [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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (659) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (636) Server: badhttpserver\r\n
+  write(37 from 37) -> (599) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (558) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (537) Content-Length: 405\r\n
+  write(2 from 2) -> (535) \r\n
+  write(405 from 405) -> (130) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(-1) -> (27) Accept-Encoding: identity\r\n
+  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (94) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (71) Server: badhttpserver\r\n
+  write(37 from 37) -> (34) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(34 from 41) -> (0) Content-Type: application/mercuria
+  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 --config badserver.closeaftersendbytes=760 serve -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()
+  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
+  [1]
+
+  $ 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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (724) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (701) Server: badhttpserver\r\n
+  write(37 from 37) -> (664) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (623) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (602) Content-Length: 405\r\n
+  write(2 from 2) -> (600) \r\n
+  write(405 from 405) -> (195) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(-1) -> (27) Accept-Encoding: identity\r\n
+  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (159) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (136) Server: badhttpserver\r\n
+  write(37 from 37) -> (99) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (58) Content-Type: application/mercurial-0.1\r\n
+  write(20 from 20) -> (38) Content-Length: 42\r\n
+  write(2 from 2) -> (36) \r\n
+  write(36 from 42) -> (0) 96ee1d7354c4ad7372047672c36a1f561e3a
+  write limit reached; closing socket
+
+  $ rm -f error.log
+
+Server sends incomplete headers for getbundle response
+
+  $ hg --config badserver.closeaftersendbytes=895 serve -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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (859) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (836) Server: badhttpserver\r\n
+  write(37 from 37) -> (799) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (758) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (737) Content-Length: 405\r\n
+  write(2 from 2) -> (735) \r\n
+  write(405 from 405) -> (330) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(-1) -> (27) Accept-Encoding: identity\r\n
+  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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: Fri, 14 Apr 2017 00:00:00 GMT\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) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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: Fri, 14 Apr 2017 00:00:00 GMT\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 --config badserver.closeaftersendbytes=933 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+TODO client spews a stack due to uncaught httplib.IncompleteRead
+
+  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
+  requesting all changes
+  [1]
+
+  $ 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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (897) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (874) Server: badhttpserver\r\n
+  write(37 from 37) -> (837) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (796) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (775) Content-Length: 405\r\n
+  write(2 from 2) -> (773) \r\n
+  write(405 from 405) -> (368) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(-1) -> (27) Accept-Encoding: identity\r\n
+  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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: Fri, 14 Apr 2017 00:00:00 GMT\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) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  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: Fri, 14 Apr 2017 00:00:00 GMT\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 --config badserver.closeaftersendbytes=945 serve -p $HGPORT -d --pid-file=hg.pid -E error.log
+  $ cat hg.pid > $DAEMON_PIDS
+
+TODO client spews a stack due to uncaught httplib.IncompleteRead
+
+  $ hg clone http://localhost:$HGPORT/ clone 2> /dev/null
+  requesting all changes
+  [1]
+
+  $ 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) -> (8) vary: \r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (909) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (886) Server: badhttpserver\r\n
+  write(37 from 37) -> (849) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (808) Content-Type: application/mercurial-0.1\r\n
+  write(21 from 21) -> (787) Content-Length: 405\r\n
+  write(2 from 2) -> (785) \r\n
+  write(405 from 405) -> (380) lookup changegroupsubset branchmap pushkey known getbundle unbundlehash batch streamreqs=generaldelta,revlogv1 bundle2=HG20%0Achangegroup%3D01%2C02%0Adigests%3Dmd5%2Csha1%2Csha512%0Aerror%3Dabort%2Cunsupportedcontent%2Cpushraced%2Cpushkey%0Ahgtagsfnodes%0Alistkeys%0Apushkey%0Aremote-changegroup%3Dhttp%2Chttps unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=none
+  readline(65537) -> (26) GET /?cmd=batch HTTP/1.1\r\n
+  readline(-1) -> (27) Accept-Encoding: identity\r\n
+  readline(-1) -> (29) vary: X-HgArg-1,X-HgProto-1\r\n
+  readline(-1) -> (41) x-hgarg-1: cmds=heads+%3Bknown+nodes%3D\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (344) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (321) Server: badhttpserver\r\n
+  write(37 from 37) -> (284) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (243) Content-Type: application/mercurial-0.1\r\n
+  write(20 from 20) -> (223) Content-Length: 42\r\n
+  write(2 from 2) -> (221) \r\n
+  write(42 from 42) -> (179) 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) -> (396) x-hgarg-1: bundlecaps=HG20%2Cbundle2%3DHG20%250Achangegroup%253D01%252C02%250Adigests%253Dmd5%252Csha1%252Csha512%250Aerror%253Dabort%252Cunsupportedcontent%252Cpushraced%252Cpushkey%250Ahgtagsfnodes%250Alistkeys%250Apushkey%250Aremote-changegroup%253Dhttp%252Chttps&cg=1&common=0000000000000000000000000000000000000000&heads=96ee1d7354c4ad7372047672c36a1f561e3a6a4c&listkeys=phases%2Cbookmarks\r\n
+  readline(-1) -> (48) x-hgproto-1: 0.1 0.2 comp=zstd,zlib,none,bzip2\r\n
+  readline(-1) -> (35) accept: application/mercurial-0.1\r\n
+  readline(-1) -> (23) host: localhost:$HGPORT\r\n
+  readline(-1) -> (49) user-agent: mercurial/proto-1.0 (Mercurial 4.2)\r\n
+  readline(-1) -> (2) \r\n
+  write(36 from 36) -> (143) HTTP/1.1 200 Script output follows\r\n
+  write(23 from 23) -> (120) Server: badhttpserver\r\n
+  write(37 from 37) -> (83) Date: Fri, 14 Apr 2017 00:00:00 GMT\r\n
+  write(41 from 41) -> (42) Content-Type: application/mercurial-0.2\r\n
+  write(28 from 28) -> (14) Transfer-Encoding: chunked\r\n
+  write(2 from 2) -> (12) \r\n
+  write(6 from 6) -> (6) 1\\r\\n\x04\\r\\n (esc)
+  write(6 from 9) -> (0) 4\r\nnon
+  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 --config badserver.closeaftersendbytes=954 serve -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: connection ended unexpectedly
+  [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 --config badserver.closeaftersendbytes=963 serve -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: connection ended unexpectedly
+  [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 --config badserver.closeaftersendbytes=966 serve -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: connection ended unexpectedly
+  [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 --config badserver.closeaftersendbytes=975 serve -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: connection ended unexpectedly
+  [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 --config badserver.closeaftersendbytes=1022 serve -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: stream ended unexpectedly (got 0 bytes, expected 4)
+  [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 --config badserver.closeaftersendbytes=1031 serve -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: stream ended unexpectedly (got 0 bytes, expected 4)
+  [255]
+
+  $ killdaemons.py $DAEMON_PIDS
+
+  $ tail -11 error.log
+  write(28 from 28) -> (100) Transfer-Encoding: chunked\r\n
+  write(2 from 2) -> (98) \r\n
+  write(6 from 6) -> (92) 1\\r\\n\x04\\r\\n (esc)
+  write(9 from 9) -> (83) 4\r\nnone\r\n
+  write(9 from 9) -> (74) 4\r\nHG20\r\n
+  write(9 from 9) -> (65) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (56) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (9) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (0) 4\\r\\n\x00\x00\x01\xd2\\r\\n (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 --config badserver.closeaftersendbytes=1504 serve -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: stream ended unexpectedly (got 0 bytes, expected 4)
+  [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 --config badserver.closeaftersendbytes=1513 serve -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: connection ended unexpectedly
+  [255]
+
+  $ killdaemons.py $DAEMON_PIDS
+
+  $ tail -13 error.log
+  write(28 from 28) -> (582) Transfer-Encoding: chunked\r\n
+  write(2 from 2) -> (580) \r\n
+  write(6 from 6) -> (574) 1\\r\\n\x04\\r\\n (esc)
+  write(9 from 9) -> (565) 4\r\nnone\r\n
+  write(9 from 9) -> (556) 4\r\nHG20\r\n
+  write(9 from 9) -> (547) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (538) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (491) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (482) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
+  write(473 from 473) -> (9) 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) -> (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 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 --config badserver.closeaftersendbytes=1710 serve -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
+  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(28 from 28) -> (779) Transfer-Encoding: chunked\r\n
+  write(2 from 2) -> (777) \r\n
+  write(6 from 6) -> (771) 1\\r\\n\x04\\r\\n (esc)
+  write(9 from 9) -> (762) 4\r\nnone\r\n
+  write(9 from 9) -> (753) 4\r\nHG20\r\n
+  write(9 from 9) -> (744) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (735) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (688) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (679) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
+  write(473 from 473) -> (206) 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) -> (197) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (188) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
+  write(38 from 38) -> (150) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
+  write(9 from 9) -> (141) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
+  write(64 from 64) -> (77) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
+  write(9 from 9) -> (68) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (59) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
+  write(41 from 41) -> (18) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\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 --config badserver.closeaftersendbytes=1713 serve -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
+  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(28 from 28) -> (782) Transfer-Encoding: chunked\r\n
+  write(2 from 2) -> (780) \r\n
+  write(6 from 6) -> (774) 1\\r\\n\x04\\r\\n (esc)
+  write(9 from 9) -> (765) 4\r\nnone\r\n
+  write(9 from 9) -> (756) 4\r\nHG20\r\n
+  write(9 from 9) -> (747) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (738) 4\\r\\n\x00\x00\x00)\\r\\n (esc)
+  write(47 from 47) -> (691) 29\\r\\n\x0bCHANGEGROUP\x00\x00\x00\x00\x01\x01\x07\x02	\x01version02nbchanges1\\r\\n (esc)
+  write(9 from 9) -> (682) 4\\r\\n\x00\x00\x01\xd2\\r\\n (esc)
+  write(473 from 473) -> (209) 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) -> (200) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (191) 4\\r\\n\x00\x00\x00 \\r\\n (esc)
+  write(38 from 38) -> (153) 20\\r\\n\x08LISTKEYS\x00\x00\x00\x01\x01\x00	\x06namespacephases\\r\\n (esc)
+  write(9 from 9) -> (144) 4\\r\\n\x00\x00\x00:\\r\\n (esc)
+  write(64 from 64) -> (80) 3a\r\n96ee1d7354c4ad7372047672c36a1f561e3a6a4c	1\npublishing	True\r\n
+  write(9 from 9) -> (71) 4\\r\\n\x00\x00\x00\x00\\r\\n (esc)
+  write(9 from 9) -> (62) 4\\r\\n\x00\x00\x00#\\r\\n (esc)
+  write(41 from 41) -> (21) 23\\r\\n\x08LISTKEYS\x00\x00\x00\x02\x01\x00		namespacebookmarks\\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
mercurial