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Name: hpack
Version: 3.0.0
Summary: Pure-Python HPACK header compression
Home-page: http://hyper.rtfd.org
Author: Cory Benfield
Author-email: cory@lukasa.co.uk
License: MIT License
Description-Content-Type: UNKNOWN
Description: ========================================
hpack: HTTP/2 Header Encoding for Python
========================================
.. image:: https://raw.github.com/Lukasa/hyper/development/docs/source/images/hyper.png
.. image:: https://travis-ci.org/python-hyper/hpack.png?branch=master
:target: https://travis-ci.org/python-hyper/hpack
This module contains a pure-Python HTTP/2 header encoding (HPACK) logic for use
in Python programs that implement HTTP/2. It also contains a compatibility
layer that automatically enables the use of ``nghttp2`` if it's available.
Documentation
=============
Documentation is available at http://python-hyper.org/hpack/.
Contributing
============
``hpack`` welcomes contributions from anyone! Unlike many other projects we are
happy to accept cosmetic contributions and small contributions, in addition to
large feature requests and changes.
Before you contribute (either by opening an issue or filing a pull request),
please `read the contribution guidelines`_.
.. _read the contribution guidelines: http://hyper.readthedocs.org/en/development/contributing.html
License
=======
``hpack`` is made available under the MIT License. For more details, see the
``LICENSE`` file in the repository.
Authors
=======
``hpack`` is maintained by Cory Benfield, with contributions from others. For
more details about the contributors, please see ``CONTRIBUTORS.rst``.
Release History
===============
3.0.0 (2017-03-29)
------------------
**API Changes (Backward Incompatible)**
- Removed nghttp2 support. This support had rotted and was essentially
non-functional, so it has now been removed until someone has time to re-add
the support in a functional form.
- Attempts by the encoder to exceed the maximum allowed header table size via
dynamic table size updates (or the absence thereof) are now forbidden.
**API Changes (Backward Compatible)**
- Added a new ``InvalidTableSizeError`` thrown when the encoder does not
respect the maximum table size set by the user.
- Added a ``Decoder.max_allowed_table_size`` field that sets the maximum
allowed size of the decoder header table. See the documentation for an
indication of how this should be used.
**Bugfixes**
- Up to 25% performance improvement decoding HPACK-packed integers, depending
on the platform.
- HPACK now tolerates receiving multiple header table size changes in sequence,
rather than only one.
- HPACK now forbids header table size changes anywhere but first in a header
block, as required by RFC 7541 ยง 4.2.
- Other miscellaneous performance improvements.
2.3.0 (2016-08-04)
------------------
**Security Fixes**
- CVE-2016-6581: HPACK Bomb. This release now enforces a maximum value of the
decompressed size of the header list. This is to avoid the so-called "HPACK
Bomb" vulnerability, which is caused when a malicious peer sends a compressed
HPACK body that decompresses to a gigantic header list size.
This also adds a ``OversizedHeaderListError``, which is thrown by the
``decode`` method if the maximum header list size is being violated. This
places the HPACK decoder into a broken state: it must not be used after this
exception is thrown.
This also adds a ``max_header_list_size`` to the ``Decoder`` object. This
controls the maximum allowable decompressed size of the header list. By
default this is set to 64kB.
2.2.0 (2016-04-20)
------------------
**API Changes (Backward Compatible)**
- Added ``HeaderTuple`` and ``NeverIndexedHeaderTuple`` classes that signal
whether a given header field may ever be indexed in HTTP/2 header
compression.
- Changed ``Decoder.decode()`` to return the newly added ``HeaderTuple`` class
and subclass. These objects behave like two-tuples, so this change does not
break working code.
**Bugfixes**
- Improve Huffman decoding speed by 4x using an approach borrowed from nghttp2.
- Improve HPACK decoding speed by 10% by caching header table sizes.
2.1.1 (2016-03-16)
------------------
**Bugfixes**
- When passing a dictionary or dictionary subclass to ``Encoder.encode``, HPACK
now ensures that HTTP/2 special headers (headers whose names begin with
``:`` characters) appear first in the header block.
2.1.0 (2016-02-02)
------------------
**API Changes (Backward Compatible)**
- Added new ``InvalidTableIndex`` exception, a subclass of
``HPACKDecodingError``.
- Instead of throwing ``IndexError`` when encountering invalid encoded integers
HPACK now throws ``HPACKDecodingError``.
- Instead of throwing ``UnicodeDecodeError`` when encountering headers that are
not UTF-8 encoded, HPACK now throws ``HPACKDecodingError``.
- Instead of throwing ``IndexError`` when encountering invalid table offsets,
HPACK now throws ``InvalidTableIndex``.
- Added ``raw`` flag to ``decode``, allowing ``decode`` to return bytes instead
of attempting to decode the headers as UTF-8.
**Bugfixes**
- ``memoryview`` objects are now used when decoding HPACK, improving the
performance by avoiding unnecessary data copies.
2.0.1 (2015-11-09)
------------------
- Fixed a bug where the Python HPACK implementation would only emit header
table size changes for the total change between one header block and another,
rather than for the entire sequence of changes.
2.0.0 (2015-10-12)
------------------
- Remove unused ``HPACKEncodingError``.
- Add the shortcut ability to import the public API (``Encoder``, ``Decoder``,
``HPACKError``, ``HPACKDecodingError``) directly, rather than from
``hpack.hpack``.
1.1.0 (2015-07-07)
------------------
- Add support for emitting 'never indexed' header fields, by using an optional
third element in the header tuple. With thanks to @jimcarreer!
1.0.1 (2015-04-19)
------------------
- Header fields that have names matching header table entries are now added to
the header table. This improves compression efficiency at the cost of
slightly more table operations. With thanks to `Tatsuhiro Tsujikawa`_.
.. _Tatsuhiro Tsujikawa: https://github.com/tatsuhiro-t
1.0.0 (2015-04-13)
------------------
- Initial fork of the code from `hyper`_.
.. _hyper: https://hyper.readthedocs.org/
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: Implementation :: CPython
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