---
features:
  - |
    Python 3.6 and 3.7 are now fully supported. If you've been testing Swift
    on Python 3, upgrade at your earliest convenience.

  - |
    Added "static symlinks", which perform some validation as they
    follow redirects and include more information about their target
    in container listings. For more information, see the `symlink middleware
    <https://docs.openstack.org/swift/latest/middleware.html#symlink>`__
    section of the documentation.

  - |
    Multi-character strings may now be used as delimiters in account
    and container listings.

upgrade:
  - |
    **Dependency update**: ``eventlet`` must be at least 0.25.0. This also
    dragged forward minimum-supported versions of ``dnspython`` (1.15.0),
    ``greenlet`` (0.3.2), and ``six`` (1.10.0).

fixes:
  - |
    Python 3 fixes:

    * Removed a request-smuggling vector when running a mixed
      py2/py3 cluster.

    * Allow ``fallocate_reserve`` to be specified as a percentage.

    * Fixed listings for sharded containers.

    * Fixed non-ASCII account metadata handling.

    * Fixed ``rsync`` output parsing.

    * Fixed some title-casing of headers.

    If you've been testing Swift on Python 3, upgrade at your earliest
    convenience.

  - |
    Sharding improvements

    * Container metadata related to sharding are now removed when no
      longer needed.

    * Empty container databases (such as might be created on handoffs)
      now shard much more quickly.

  - |
    The ``proxy-server`` now ignores 404 responses from handoffs that have
    no data when deciding on the correct response for object requests,
    similar to what it already does for account and container requests.

  - |
    Static Large Object sizes in listings for versioned containers are
    now more accurate.

  - |
    When refetching Static Large Object manifests, non-manifest responses
    are now handled better.

  - |
    S3 API now translates ``503 Service Unavailable`` responses to a more
    S3-like response instead of raising an error.

  - |
    Improved proxy-to-backend requests to be more RFC-compliant.

  - |
    Various other minor bug fixes and improvements.