Log Message:
Twisted Core 17.1.0 (2017-02-04)
================================

Features
--------
 - Added a new interface,
   twisted.internet.interfaces.IHostnameResolver, which is an
   improvement to twisted.internet.interfaces.IResolverSimple that
   supports resolving multiple addresses as well as resolving IPv6
   addresses.  This is a native, asynchronous, Twisted analogue to
   getaddrinfo. (bug-4362)
 - twisted.web.client.Agent now uses HostnameEndpoint internally; as a
   consequence, it now supports IPv6, as well as making connections
   faster and more reliably to hosts that have more than one DNS name.
   (bug-6712)
 - twisted.internet.ssl.CertificateOptions now has the new constructor
   argument 'raiseMinimumTo', allowing you to increase the minimum TLS
   version to this version or Twisted's default, whichever is higher.
   The additional new constructor arguments 'lowerMaximumSecurityTo'
   and 'insecurelyLowerMinimumTo' allow finer grained control over
   negotiated versions that don't honour Twisted's defaults, for
   working around broken peers, at the cost of reducing the security
   of the TLS it will negotiate. (bug-6800)
 - twisted.internet.ssl.CertificateOptions now sets the OpenSSL
   context's mode to MODE_RELEASE_BUFFERS, which will free the
   read/write buffers on idle TLS connections to save memory. (bug-8247)
 - trial --help-reactors will only list reactors which can be
   imported.  (bug-8745)
 - twisted.internet.endpoints.HostnameEndpoint now uses the passed
   reactor's implementation of
   twisted.internet.interfaces.IReactorPluggableResolver to resolve
   hostnames rather than its own deferToThread/getaddrinfo wrapper;
   this makes its hostname resolution pluggable via a public API.
   (bug-8922)
 - twisted.internet.reactor.spawnProcess now does not emit a
   deprecation warning on Unicode arguments. It will encode Unicode
   arguments down to bytes using the filesystem encoding on UNIX and
   Python 2 on Windows, and pass Unicode through unchanged on Python 3
   on Windows. (bug-8941)
 - twisted.trial._dist.test.test_distreporter now works on Python 3.
   (bug-8943)

Bugfixes
--------
 - trial --help-reactors will now display iocp and win32er reactors
   with Python 3. (bug-8745)
 - twisted.logger._flatten.flattenEvent now handles log_format being
   None instead of assuming the value is always a string. (bug-8860)
 - twisted.protocol.ftp is now Python 3 compatible (bug-8865)
 - twisted.names.client.Resolver can now resolve names with IPv6 DNS
   servers. (bug-8877)
 - twisted.application.internet.ClientService now waits for existing
   connections to disconnect before trying to connect again when
   restarting. (bug-8899)
 - twisted.internet.unix.Server.doRead and
   twisted.internet.unix.Client.doRead no longer fail if recvmsg's
   ancilliary data contains more than one file descriptor. (bug-8911)
 - twist on Python 3 now correctly prints the help text when given no
   plugin to run. (bug-8918)
 - twisted.python.sendmsg.sendmsg no longer segfaults on Linux +
   Python 2. (bug-8969)
 - IHandshakeListener providers connected via SSL4ClientEndpoint will
   now have their handshakeCompleted methods called. (bug-8973)
 - The twist script now respects the --reactor option. (bug-8983)
 - Fix crash when using SynchronousTestCase with Warning object which
   does not store a string as its first argument (like
   libmysqlclient). (bug-9005)
 - twisted.python.compat.execfile() does not open files with the
   deprecated 'U' flag on Python 3. (bug-9012)

Deprecations and Removals
-------------------------
 - twisted.internet.ssl.CertificateOption's 'method' constructor
   argument is now deprecated, in favour of the new 'raiseMinimumTo',
   'lowerMaximumSecurityTo', and 'insecurelyLowerMinimumTo' arguments.
   (bug-6800)
 - twisted.protocols.telnet (not to be confused with the supported
   twisted.conch.telnet), deprecated since Twisted 2.5, has been
   removed. (bug-8925)
 - twisted.application.strports.parse, as well as the deprecated
   default arguments in strports.service/listen, deprecated since
   Twisted 10.2, has been removed. (bug-8926)
 - twisted.web.client.getPage and twisted.web.client.downloadPage have
   been deprecated in favour of https://pypi.org/project/treq and
   twisted.web.client.Agent. (bug-8960)
 - twisted.internet.defer.timeout is deprecated in favor of
   twisted.internet.defer.Deferred.addTimeout (bug-8971)