This document is for py-amqp's development version, which can be significantly different from previous releases. Get the stable docs here: 2.3.


py-amqp is fork of amqplib used by Kombu containing additional features and improvements. The previous amqplib changelog is here:


release-date:2019-03-03 10:45 P.M UTC+2:00
release-by:Omer Katz
  • Added support for the Cygwin platform

    Contributed by Matus Valo

  • Correct offset incrementation when parsing bitmaps.

    Contributed by Allan Simon & Omer Katz

  • Consequent bitmaps are now parsed correctly.

    Previously the bit counter was reset with every bit. We now reset it once per 8 bits, when we consume the next byte.

    Contributed by Omer Katz

Code Cleanups & Improvements:

  • Patrick Cloke
  • Matus Valo
  • Jeremiah Cooper
  • Omer Katz

Test Coverage & CI Improvements:

  • Matus Valo
  • Omer Katz
  • Jeremiah Cooper
  • Omer Katz


release-date:2018-04-02 9:00 A.M UTC+2
release-by:Omer Katz
  • To avoid breaking the API basic_consume() now returns the consumer tag instead of a tuple when nowait is True.

    Fix contributed by Matus Valo

  • Fix crash in basic_publish when broker does not support connection.blocked capability.

    Fix contributed by Matus Valo

  • read_frame() is now Python 3 compatible for large payloads.

    Fix contributed by Antonio Ojea

  • Support float read_timeout/write_timeout.

    Fix contributed by :github_user:`cadl`

  • Always treat SSLError timeouts as socket timeouts.

    Fix contributed by Dirk Mueller and Antonio Ojea

  • Treat EWOULDBLOCK as timeout.

    This fixes a regression on Windows from 2.4.0.

    Fix contributed by Lucian Petrut

Test Coverage & CI Improvements:

  • Matus Valo
  • Antonio Ojea


release-date:2018-13-01 1:00 P.M UTC+2
release-by:Omer Katz
  • Fix inconsistent frame_handler return value.

    The function returned by frame_handler is meant to return True once the complete message is received and the callback is called, False otherwise.

    This fixes the return value for messages with a body split across multiple frames, and heartbeat frames.

    Fix contributed by :github_user:`evanunderscore`

  • Don’t default content_encoding to utf-8 for bytes.

    This is not an acceptable default as the content may not be valid utf-8, and even if it is, the producer likely does not expect the message to be decoded by the consumer.

    Fix contributed by :github_user:`evanunderscore`

  • Fix encoding of messages with multibyte characters.

    Body length was previously calculated using string length, which may be less than the length of the encoded body when it contains multibyte sequences. This caused the body of the frame to be truncated.

    Fix contributed by :github_user:`evanunderscore`

  • Respect content_encoding when encoding messages.

    Previously the content_encoding was ignored and messages were always encoded as utf-8. This caused messages to be incorrectly decoded if content_encoding is properly respected when decoding.

    Fix contributed by :github_user:`evanunderscore`

  • Fix AMQP protocol header for AMQP 0-9-1.

    Previously it was set to a different value for unknown reasons.

    Fix contributed by Carl Hörberg

  • Add support for Python 3.7.

    Change direct SSLSocket instantiation with wrap_socket. Added Python 3.7 to CI.

    Fix contributed by Omer Katz and :github_user:`avborhanian`

  • Add support for field type “x” (byte array).

    Fix contributed by Davis Kirkendall

  • If there is an exception raised on Connection.connect or Connection.close, ensure that the underlying transport socket is closed.

    Adjust exception message on connection errors as well.

    Fix contributed by :github_user:`tomc797`

  • TCP_USER_TIMEOUT has to be excluded from KNOWN_TCP_OPTS in BSD platforms.

    Fix contributed by George Tantiras

  • Handle negative acknowledgments.

    Fix contributed by Matus Valo

  • Added integration tests.

    Fix contributed by Matus Valo

  • Fix basic_consume() with no consumer_tag provided.

    Fix contributed by Matus Valo

  • Improved empty AMQPError string representation.

    Fix contributed by Matus Valo

  • Drain events before publish.

    This is needed to capture out of memory messages for clients that only publish. Otherwise on_blocked is never called.

    Fix contributed by Jelte Fennema and Matus Valo

  • Don’t revive channel when connection is closing.

    When connection is closing don’t raise error when Channel.Close method is received.

    Fix contributed by Matus Valo


release-date:2018-05-29 15:30 P.M UTC+3
release-by:Omer Katz
  • Fix a regression that occurs when running amqp on OSX.

    TCP_USER_TIMEOUT is not available when running on OSX. We now remove it from the set of known TCP options.

    Fix contributed by Ofer Horowitz


release-date:2018-05-28 16:30 P.M UTC+3
release-by:Omer Katz
  • Fix a regression that occurs when running amqp under Python 2.7.

    #182 mistakenly replaced a type check with unicode to string_t which is str in Python 2.7. text_t should have been used instead. This is now fixed and the tests have been adjusted to ensure this never regresses again.

    Fix contributed by Omer Katz


release-date:2018-05-27 16:30 P.M UTC+3
release-by:Omer Katz
  • Cleanup TCP configurations across platforms and unified defaults.

    Fix contributed by Dan Chowdhury

  • Fix for TypeError when setting socket options.

    Fix contributed by Matthias Erll

  • Ensure that all call sites for decoding bytes to str allow surrogates, as the encoding mechanism now supports.

    Fix contributed by Stephen Hatch

  • Don’t send AAAA DNS request when domain resolved to IPv4 address.

    Fix contributed by Ihar Hrachyshka & Omer Katz

  • Support for EXTERNAL authentication and specific login_method.

    Fix contributed by Matthias Erll

  • If the old python-gssapi library is installed the gssapi module will be available. We now ensure that we only use the new gssapi library.

    Fix contributed by Jacopo Notarstefano

Code Cleanups & Test Coverage:


release-date:2017-09-14 09:00 A.M UTC+2
release-by:Omer Katz
  • Sending empty messages no longer hangs. Instead an empty message is sent correctly.(addresses #151)

    Fix contributed by Christian Blades

  • Fixed compatibility issues in UTF-8 encoding behavior between Py2/Py3 (#164)

    Fix contributed by Tyler James Harden


release-date:2017-07-14 09:00 A.M UTC+2
release-by:Omer Katz
  • Fix implicit conversion from bytes to string on the connection object. (Issue #155)

    This issue has caused Celery to crash on connection to RabbitMQ.

    Fix contributed by Omer Katz


release-date:2017-07-12 10:00 A.M UTC+2
release-by:Ask Solem
  • Fix random delays in task execution.

    This is a bug that caused performance issues due to polling timeouts that occur when receiving incomplete AMQP frames. (Issues #3978 #3737 #3814)

    Fix contributed by Robert Kopaczewski

  • Calling conn.collect() multiple times will no longer raise an AttributeError when no channels exist.

    Fix contributed by Gord Chung

  • Fix compatibility code for Python 2.7.6.

    Fix contributed by Jonathan Schuff

  • When running in Windows, py-amqp will no longer use the unsupported TCP option TCP_MAXSEG.

    Fix contributed by Tony Breeds

  • Added support for setting the SNI hostname header.

    The SSL protocol version is now set to SSLv23

    Contributed by Dhananjay Sathe

  • Authentication mechanisms were refactored to be more modular. GSSAPI authentication is now supported.

    Contributed by Alexander Dutton

  • Do not reconnect on collect.

    Fix contributed by Gord Chung


release-date:2016-12-14 03:40 P.M PST
release-by:Ask Solem
  • Removes byte string comparison warnings when running under python -b.

    Fix contributed by Jon Dufresne.

  • Linux version parsing broke when the version included a ‘+’ character (Issue #119).

  • Now sets default TCP settings for platforms that support them (e.g. Linux).

    Constant Value
    TCP_USER_TIMEOUT 1000 (1s)

    This will help detecting the socket being closed earlier, which is very important in failover and load balancing scenarios.


release-date:2016-12-07 06:00 P.M PST
release-by:Ask Solem
  • Fixes compatibility with Python 2.7.5 and below (Issue #107).


release-date:2016-12-07 02:00 P.M PST
  • Linux: Now sets the TCP_USER_TIMEOUT flag if available for better failed connection detection.

    Contributed by Jelte Fennema.

    The timeout is set to the connect_timeout value by default, but can also be specified by using the socket_settings argument to Connection:

    from amqp import Connection
    from amqp.platform import TCP_USER_TIMEOUT
    conn = Connection(socket_settings={
        TCP_USER_TIMEOUT: int(60 * 1000),  # six minutes in ms.

    When using Kombu this can be specified as part of the transport_options:

    from amqp.platform import TCP_USER_TIMEOUT
    from kombu import Connection
    conn = Connection(transport_options={
        'socket_settings': {
            TCP_USER_TIMEOUT: int(60 * 1000),  # six minutes in ms.

    Or when using Celery it can be specified using the broker_transport_options setting:

    from amqp.platform import TCP_USER_TIMEOUT
    from celery import Celery
    app = Celery()
            TCP_USER_TIMEOUT: int(60 * 1000),  # six minutes in ms.
  • Python compatibility: Fixed compatibility when using the python -b flag.

    Fix contributed by Jon Dufresne.


release-date:2016-10-13 06:36 P.M PDT
release-by:Ask Solem
  • Requirements

    • Now depends on Vine 1.1.3.
  • Frame writer: Account for overhead when calculating frame size.

    The client would crash if the message was within a certain size.

  • Fixed struct unicode problems (#108)

    • Standardize pack invocations on bytestrings.
    • Leave some literals as strings to enable interpolation.
    • Fix flake8 fail.

    Fix contributed by Brendan Smithyman.


release-date:2016-09-07 04:23 P.M PDT
release-by:Ask Solem
  • Requirements

    • Now depends on Vine 1.1.2.
  • Now licensed under the BSD license!

    Thanks to Barry Pederson for approving the license change, which unifies the license used across all projects in the Celery organization.

  • Datetimes in method frame arguments are now handled properly.

  • Fixed compatibility with Python <= 2.7.6

  • Frame_writer is no longer a generator, which should solve a rare “generator already executing” error (Issue #103).


release-date:2016-07-11 08:00 P.M PDT
release-by:Ask Solem
  • SSLTransport: Fixed crash “no attribute sslopts” when ssl=True (Issue #100).

  • Fixed incompatible argument spec for Connection.Close (Issue #45).

    This caused the RabbitMQ server to raise an exception (INTERNAL ERROR).

  • Transport: No longer implements __del__ to make sure gc can collect connections.

    It’s the responsibility of the caller to close connections, this was simply a relic from the amqplib library.


release-date:2016-06-10 5:40 P.M PDT
release-by:Ask Solem
  • Python 3: Installation requirements ended up being a generator and crashed

    Fix contributed by ChangBo Guo(gcb).

  • Python <= 2.7.7: struct.pack arguments cannot be unicode

    Fix contributed by Alan Justino and Xin Li.

  • Python 3.4: Fixed use of bytes % int.

    Fix contributed by Alan Justino.

  • Connection/Transport: Fixed handling of default port.

    Fix contributed by Quentin Pradet.


release-date:2016-05-31 6:20 P.M PDT
release-by:Ask Solem
  • Adds backward compatibility layer for the 1.4 API.

    Using the connection without calling .connect() first will now work, but a warning is emitted and the behavior is deprecated and will be removed in version 2.2.

  • Fixes kombu 3.0/celery 3.1 compatibility (Issue #88).

    Fix contributed by Bas ten Berge.

  • Fixed compatibility with Python 2.7.3 (Issue #85)

    Fix contributed by Bas ten Berge.

  • Fixed bug where calling drain_events() with a timeout of 0 would actually block until a frame is received.

  • Documentation moved to (Issue #89).

    See for the reasoning behind this change.

    Fix contributed by Adam Chainz.


release-date:2016-05-26 1:44 P.M PDT
release-by:Ask Solem
  • No longer supports Python 2.6

  • You must now call Connection.connect() to establish the connection.

    The Connection constructor no longer has side effects, so you have to explicitly call connect first.

  • Library rewritten to anticipate async changes.

  • Connection now exposes underlying socket options.

    This change allows to set arbitrary TCP socket options during the creation of the transport.

    Those values can be set passing a dictionray where the key is the name of the parameter we want to set. The names of the keys are the ones reported above.

    Contributed by Andrea Rosa, Dallas Marlow and Rongze Zhu.

  • Additional logging for heartbeats.

    Contributed by Davanum Srinivas, and Dmitry Mescheryakov.

  • SSL: Fixes issue with remote connection hanging

    Fix contributed by Adrien Guinet.

  • SSL: ssl dict argument now supports the check_hostname key

    (Issue #63).

    Contributed by Vic Kumar.

  • Contributions by:

    Adrien Guinet Andrea Rosa Artyom Koval Corey Farwell Craig Jellick Dallas Marlow Davanum Srinivas Federico Ficarelli Jared Lewis Rémy Greinhofer Rongze Zhu Yury Selivanov Vic Kumar Vladimir Bolshakov @lezeroq


release-date:2016-01-08 5:50 P.M PST
release-by:Ask Solem
  • Fixes compatibility with Linux/macOS instances where the ctypes module does not exist.

    Fix contributed by Jared Lewis.


release-date:2015-12-07 12:25 A.M
release-by:Ask Solem
  • abstract_channel.wait now accepts a float timeout parameter expressed

    in seconds

    Contributed by Goir.


release-date:2015-10-02 05:30 P.M PDT
release-by:Ask Solem
  • Fixed libSystem error on macOS 10.11 (El Capitan)

    Fix contributed by Eric Wang.

  • channel.basic_publish now raises amqp.exceptions.NotConfirmed on


  • AMQP timestamps received are now converted from GMT instead of local time

    (Issue #67).

  • Wheel package installation now supported by both Python 2 and Python3.

    Fix contributed by Rémy Greinhofer.


release-date:2014-08-11 06:00 P.M UTC
release-by:Ask Solem
  • Now keeps buffer when socket times out.

    Fix contributed by Artyom Koval.

  • Adds Connection.Transport attribute that can be used to specify a different transport implementation.

    Contributed by Yury Selivanov.


release-date:2014-04-15 09:00 P.M UTC
release-by:Ask Solem
  • Can now deserialize more AMQP types.

    Now handles types short string, short short int, short short unsigned int, short int, short unsigned int, long unsigned int, long long int, long long unsigned int and float which for some reason was missing, even in the original amqplib module.

  • SSL: Workaround for Python SSL bug.

    A bug in the python socket library causes on a closed socket to raise AttributeError instead of IOError.

    Fix contributed by Craig Jellick.

  • Transport.__del_ now handles errors occurring at late interpreter shutdown (Issue #36).


release-date:2014-03-03 04:00 P.M UTC
release-by:Ask Solem
  • SSL transport accidentally disconnected after read timeout.

    Fix contributed by Craig Jellick.


release-date:2014-02-09 03:00 P.M UTC
release-by:Ask Solem
  • Fixed bug where more data was requested from the socket than was actually needed.

    Contributed by Ionel Cristian Mărieș.


release-date:2014-01-23 05:00 P.M UTC
  • Heartbeat negotiation would use heartbeat value from server even if heartbeat disabled (Issue #31).


release-date:2014-01-14 09:30 P.M UTC
release-by:Ask Solem
  • Fixed error occurring when heartbeats disabled.


release-date:2014-01-13 03:00 P.M UTC
release-by:Ask Solem
  • Heartbeat implementation improved (Issue #6).

    The new heartbeat behavior is the same approach as taken by the RabbitMQ java library.

    This also means that clients should preferably call the heartbeat_tick method more frequently (like every second) instead of using the old rate argument (which is now ignored).

    • Heartbeat interval is negotiated with the server.
    • Some delay is allowed if the heartbeat is late.
    • Monotonic time is used to keep track of the heartbeat instead of relying on the caller to call the checking function at the right time.

    Contributed by Dustin J. Mitchell.

  • NoneType is now supported in tables and arrays.

    Contributed by Dominik Fässler.

  • SSLTransport: Now handles ENOENT.

    Fix contributed by Adrien Guinet.


release-date:2013-11-11 03:30 P.M UTC
release-by:Ask Solem
  • SSLTransport: Now keeps read buffer if an exception is raised (Issue #26).

    Fix contributed by Tommie Gannert.


release-date:2013-10-29 02:00 P.M UTC
release-by:Ask Solem
  • is now a channel object (not the channel id).
  • Bug in previous version caused the socket to be flagged as disconnected at EAGAIN/EINTR.


release-date:2013-10-24 04:00 P.M UTC
release-by:Ask Solem
  • Now implements Connection.connected (Issue #22).
  • Fixed bug where str(AMQPError) did not return string.


release-date:2013-09-04 02:39 P.M UTC
release-by:Ask Solem
  • Now sets on delivery (Issue #12)

    amqplib used to make the channel object available as Message.delivery_info['channel'], but this was removed in py-amqp. librabbitmq sets, which is a more reasonable solution in our opinion as that keeps the delivery info intact.

  • New option to wait for publish confirmations (Issue #3)

    There is now a new Connection confirm_publish that will force any basic_publish call to wait for confirmation.

    Enabling publisher confirms like this degrades performance considerably, but can be suitable for some applications and now it’s possible by configuration.

  • queue_declare now returns named tuple of type basic_declare_ok_t.

    Supporting fields: queue, message_count, and consumer_count.

  • Contents of Channel.returned_messages is now named tuples.

    Supporting fields: reply_code, reply_text, exchange, routing_key, and message.

  • Sockets now set to close on exec using the FD_CLOEXEC flag.

    Currently only supported on platforms supporting this flag, which does not include Windows.

    Contributed by Tommie Gannert.


release-date:2013-08-16 05:30 P.M UTC
release-by:Ask Solem
  • Adds promise type: amqp.utils.promise()
  • Merges fixes from 1.0.x


release-date:2012-11-12 04:00 P.M UTC
release-by:Ask Solem
  • New exception hierarchy:

    • AMQPError
      • ConnectionError
        • RecoverableConnectionError
          • ConsumerCancelled
          • ConnectionForced
          • ResourceError
        • IrrecoverableConnectionError
          • ChannelNotOpen
          • FrameError
          • FrameSyntaxError
          • InvalidCommand
          • InvalidPath
          • NotAllowed
          • UnexpectedFrame
          • AMQPNotImplementedError
          • InternalError
      • ChannelError
        • RecoverableChannelError
          • ContentTooLarge
          • NoConsumers
          • ResourceLocked
        • IrrecoverableChannelError
          • AccessRefused
          • NotFound
          • PreconditionFailed


release-date:2013-11-08 10:36 P.M UTC
release-by:Ask Solem
  • No longer supports Python 2.5
  • Fixed receiving of float table values.
  • Now Supports Python 3 and Python 2.6+ in the same source code.
  • Python 3 related fixes.


release-date:2013-07-31 04:00 P.M BST
release-by:Ask Solem
  • Fixed problems with the SSL transport (Issue #15).

    Fix contributed by Adrien Guinet.

  • Small optimizations


release-date:2013-06-25 02:00 P.M BST
release-by:Ask Solem
  • Fixed another Python 3 compatibility problem.


release-date:2013-04-11 06:00 P.M BST
release-by:Ask Solem
  • Fixed Python 3 incompatibility in amqp/


release-date:2013-03-21 03:30 P.M UTC
release-by:Ask Solem
  • Fixed Python 3 incompatibility in amqp/ (Issue #11).


release-date:2013-03-08 10:40 A.M UTC
release-by:Ask Solem
  • Publisher ack callbacks should now work after typo fix (Issue #9).
  • channel(explicit_id) will now claim that id from the array of unused channel ids.
  • Fixes Jython compatibility.


release-date:2013-02-08 01:00 P.M UTC
release-by:Ask Solem
  • Fixed SyntaxError on Python 2.5


release-date:2013-02-08 01:00 P.M UTC
release-by:Ask Solem
  • Workaround for bug on some Python 2.5 installations where (2**32) is 0.

  • Can now serialize the ARRAY type.

    Contributed by Adam Wentz.

  • Fixed tuple format bug in exception (Issue #4).


release-date:2012-11-29 01:14 P.M UTC
release-by:Ask Solem
  • Channel.close is now ignored if the connection attribute is None.


release-date:2012-11-21 04:00 P.M UTC
release-by:Ask Solem
  • Channel.basic_cancel is now ignored if the channel was already closed.

  • is now a dict of sets:



release-date:2012-11-13 04:00 P.M UTC
release-by:Ask Solem
  • Fixes Python 2.5 support


release-date:2012-11-12 04:00 P.M UTC
release-by:Ask Solem
  • Now can also handle float in headers/tables when receiving messages.
  • Now uses array.array to keep track of unused channel ids.
  • The METHOD_NAME_MAP has been updated for amqp/0.9.1 and Rabbit extensions.
  • Removed a bunch of accidentally included images.


release-date:2012-11-06 05:00 P.M UTC
release-by:Ask Solem
  • Now supports float values in headers/tables.


release-date:2012-11-05 01:00 P.M UTC
release-by:Ask Solem
  • Connection errors no longer includes AttributeError.

  • Fixed problem with using the SSL transport in a non-blocking context.

    Fix contributed by Mher Movsisyan.


release-date:2012-11-05 01:00 P.M UTC
release-by:Ask Solem
  • Channels are now restored on channel error, so that the connection does not have to closed.

Version 0.9.4

  • Adds support for exchange_bind and exchange_unbind.

    Contributed by Rumyana Neykova

  • Fixed bugs in funtests and demo scripts.

    Contributed by Rumyana Neykova

Version 0.9.3

  • Fixed bug that could cause the consumer to crash when reading large message payloads asynchronously.
  • Serialization error messages now include the invalid value.

Version 0.9.2

  • Consumer cancel notification support was broken (Issue #1)

    Fix contributed by Andrew Grangaard

Version 0.9.1

  • Supports draining events from multiple channels (Connection.drain_events)
  • Support for timeouts
  • Support for heartbeats
    • Connection.heartbeat_tick(rate=2) must called at regular intervals (half of the heartbeat value if rate is 2).
    • Or some other scheme by using Connection.send_heartbeat.
  • Supports RabbitMQ extensions:
    • Consumer Cancel Notifications
      • by default a cancel results in ChannelError being raised
      • but not if a on_cancel callback is passed to basic_consume.
    • Publisher confirms
      • Channel.confirm_select() enables publisher confirms.
      •['basic_ack'].append(my_callback) adds a callback to be called when a message is confirmed. This callback is then called with the signature (delivery_tag, multiple).
  • Support for basic_return
  • Uses AMQP 0-9-1 instead of 0-8.
    • Channel.access_request and ticket arguments to methods removed.
    • Supports the arguments argument to basic_consume.
    • internal argument to exchange_declare removed.
    • auto_delete argument to exchange_declare deprecated
    • insist argument to Connection removed.
    • Channel.alerts has been removed.
    • Support for Channel.basic_recover_async.
    • Channel.basic_recover deprecated.
  • Exceptions renamed to have idiomatic names:
    • AMQPException -> AMQPError
    • AMQPConnectionException -> ConnectionError``
    • AMQPChannelException -> ChannelError``
    • Connection.known_hosts removed.
    • Connection no longer supports redirects.
    • exchange argument to queue_bind can now be empty to use the “default exchange”.
  • Adds Connection.is_alive that tries to detect whether the connection can still be used.
  • Adds Connection.connection_errors and .channel_errors, a list of recoverable errors.
  • Exposes the underlying socket as Connection.sock.
  • Adds Channel.no_ack_consumers to keep track of consumer tags that set the no_ack flag.
  • Slightly better at error recovery