Connexion 3.0: API-first for all

We are excited to announce the release of Connexion 3.0! 🎉

Connexion 3 fundamentally changes how Connexion is designed and implemented, and how it
fits into the wider Python API ecosystem. We adopted the ASGI interface, which makes Connexion both
modular and well-integrated with most modern Python API tooling.

It brings some major changes compared to 2.X:

• The improved App and new AsyncApp allow you to use Connexion as a stand-alone framework
  • The App interface was extended so you no longer have to care about the framework used
    underneath
• Connexion can now be used as middleware to supercharge any ASGI or WSGI-compatible framework
  with its spec-based functionality
• Connexion is now pluggable in many dimensions:
  • All Connexion functionality is pluggable by adding or removing middleware from its stack
  • Validation is now pluggable by content type, solving longstanding issues regarding endpoints
    with multiple content types and making it easy to add validation for additional content types
  • Authentication is now pluggable by security scheme, making it easy to customize the behavior or
    add support for additional security schemes.
• Aiohttp support has been dropped due to lack of ASGI support
• We spent a lot of effort on extending and improving our documentation_

For further details, check:

• Our Connexion 3 documentation page for a high level overview of the changes
• Our in-depth blog post on the redesign for technical details
• Below for a detailed overview of all changes 👇

Full changelog

• Drop aiohttp support by @RobbeSneyders in #1491
• Add Python 3.10 in favor of 3.6 by @RobbeSneyders in #1494
• Add empty connexion middleware by @RobbeSneyders in #1502
• Extract Swagger UI functionality into middleware by @RobbeSneyders in #1496
• Add pre-commit hook by @RobbeSneyders in #1511
• Add routing middleware by @RobbeSneyders in #1497
• Extract security to middleware by @RobbeSneyders in #1514
• Remove myself (Rafael Caricio) as maintainer by @rafaelcaricio in #1517
• Merge V2 to main by @RobbeSneyders in #1518
• Fix deprecation warning for Validator.iter_errors by @jonasboecquaert in #1536
• Refactor routing into middleware-api-operation model by @RobbeSneyders in #1533
• Clean up operation classes by @RobbeSneyders in #1535
• Removed jsonschema version check by @jonasboecquaert in #1540
• Remove built-in support for uWSGI by @jacobstanly89 in #1544
• Fix for bug of the function is_json_mimetype() by @jacobstanly89 in #1541
• Use resolver in security middleware by @RobbeSneyders in #1553
• call as_view in methodresolver by @bluebrown in #1552
• Fix async tests by @Ruwann in #1558
• Add test for MethodViewResolver by @RobbeSneyders in #1559
• debug mode interaction for non-flask server by @thvu11 in #1556
• Add .git-blame-ignore-revs file with black commit by @RobbeSneyders in #1561
• Feature/method views args by @bluebrown in #1564
• Activate mypy check in pre-commit by @RobbeSneyders in #1560
• Remove "type: ignore" by using list(dict), not dict.keys() by @cclauss in #1575
• Merge v2 to main by @RobbeSneyders in #1579
• Resolve $ref referring to another $ref by @chibacchie in #1584
• Update json for Flask 2.3 by @RobbeSneyders in #1582
• Use Flask request_ctx instead of _request_ctx_stack by @RobbeSneyders in #1583
• setup.py: Update url by @jayvdb in #1586
• Extract JSON request body validation to middleware by @RobbeSneyders in #1588
• Remove AbstractSwaggerUIAPI class by @RobbeSneyders in #1589
• Removed internal variable pass_context_arg_name by @leonardofesta in #1568
• Explicitly support Flask async routes by @RobbeSneyders in #1592
• Extract boilerplate code into Routed base classes by @RobbeSneyders in #1590
• Move JSON response body validation to middleware by @RobbeSneyders in #1591
• Remove support for deprecated x-body-name position by @RobbeSneyders in #1600
• Avoid warning with jsonschema 4.16.0 by @gaetano-guerriero in #1601
• Add form data validator for validation middleware by @RobbeSneyders in #1595
• Flask apps only signal an exception on real server errors by @enerqi in #1611
• Move parameter validation to middleware by @RobbeSneyders in #1610
• Add async app by @RobbeSneyders in #1613
• Update examples for Connexion 3.0 by @RobbeSneyders in #1615
• Refactor decorators by @RobbeSneyders in #1618
• Switch to own maintained version of swagger-ui by @RobbeSneyders in #1619
• Expose additional context by @RobbeSneyders in #1620
• Implement user facing interface for ConnexionMiddleware by @RobbeSneyders in #1621
• Enable enforcing defaults by @RobbeSneyders in #1616
• Cache operation body definition by @RobbeSneyders in #1626
• Coerce types only in uri parser by @RobbeSneyders in #1627
• Introduce poetry by @RobbeSneyders in #1628
• Bump httpx version to 0.23 to mitigate GHSA-h8pj-cxx2-jfg2 by @RobbeSneyders in #1632
• Refactor tests by @RobbeSneyders in #1631
• Define request interface and align WSGI and ASGI by @RobbeSneyders in #1636
• Feature/request context by @RobbeSneyders in #1639
• Add error handlers for AsyncApp by @RobbeSneyders in #1640
• Make tests framework agnostic by @RobbeSneyders in #1634
• Bump starlette version by @Ruwann in #1641
• Bump a2wsgi and drop monkeypatch by @RobbeSneyders in #1647
• Update NumberConverter regex to match new Werkzeug behavior (v3) by @RobbeSneyders in #1644
• Re-add tests for multiple and mixed file uploads by @RobbeSneyders in #1642
• Add support for relative refs in spec by @RobbeSneyders in #1648
• Clean up errors and fix hierarchy by @RobbeSneyders in #1649
• Enforce required RequestBody by @RobbeSneyders in #1652
• Create abstract validator classes by @RobbeSneyders in #1653
• Enable response mimetype validation for non-error responses by @RobbeSneyders in #1654
• Don't return 400 when read-only property is provided by @RobbeSneyders in #1655
• Add jsonifier as argument to app / api by @RobbeSneyders in #1656
• Add high-level documentation for 3.0 by @RobbeSneyders in #1646
• Run release pipeline for pre-releases as well by @RobbeSneyders in #1658
• Fix filter pattern in release pipeline by @RobbeSneyders in #1659
• Fix ReadTheDocs config for Poetry by @RobbeSneyders in #1663
• Update quickstart.rst to include example of passing server arguments by @rkrishnasanka in #1645
• Fix and extend v3 documentation by @RobbeSneyders in #1664
• Update docs index page by @RobbeSneyders in #1665
• Delay import error for optional flask depencendy by @RobbeSneyders in #1668
• Update Operations to act as wrapper of wrapped view function by @RobbeSneyders in #1669
• Add explicit asgiref dependency by @RobbeSneyders in #1667
• Pass through lifespan events by @RobbeSneyders in #1673
• Add lifespan middleware by @RobbeSneyders in #1676
• Fix examples links in security doc page by @opheron in #1677
• Fix stream replay in validators by @RobbeSneyders in #1678
• Make security pluggable by @Ruwann in #1671
• Add tests for strict validation in combination with api key in query by @Ruwann in #1681
• Update CLI for 3.0 by @RobbeSneyders in #1687
• Add add_middleware interface by @RobbeSneyders in #1683
• Add test for security_map argument by @Ruwann in #1691
• Inspect middleware parameters before passing in lifespan by @RobbeSneyders in #1686
• Remove context keyword from security handlers by @Ruwann in #1690
• Unpack error handler when registering on middleware by @RobbeSneyders in #1695
• Use logger error instead of exception by @Ruwann in #1692
• Fix add_middleware enum comparison by @RobbeSneyders in #1698
• Move from caret to inequality requirements by @marcin-lulek-cint in #1704
• Improve and fix docs index page by @RobbeSneyders in #1700
• Update quickstart documentation by @RobbeSneyders in #1701
• Add traceback info to common error handler by @Ruwann in #1708
• Add middleware documentation by @RobbeSneyders in #1706
• Deepcopy only headers in validator by @RobbeSneyders in #1710
• Use repr for error logging by @Ruwann in #1711
• Fix typo by @julienschuermans in #1713
• Bugfix/basepath by @Ruwann in #1716
• Bump starlette by @RobbeSneyders in #1734
• Make middleware_app property private by @RobbeSneyders in #1737
• Update routing documentation by @RobbeSneyders in #1738
• chore: fix typos by @afuetterer in #1740
• Add swagger-ui docs and clean up swagger-ui options by @RobbeSneyders in #1739
• Update request handling documentation by @RobbeSneyders in #1741
• Update response handling documenation by @RobbeSneyders in #1742
• Support multiple APIs with same base path by @RobbeSneyders in #1736
• Add validation documentation by @RobbeSneyders in #1743
• Remove debug argument from example by @RobbeSneyders in #1749
• Add context documentation by @RobbeSneyders in #1747
• Feature/get delete body by @Ruwann in #1712
• Drop Python 3.7 in favor of 3.11 and 3.12 by @RobbeSneyders in #1752
• Create FUNDING.yml by @RobbeSneyders in #1753
• Centralize error handling in ExceptionMiddleware by @RobbeSneyders in #1754
• Add lifespan documentation by @RobbeSneyders in #1759
• Add testing documentation by @RobbeSneyders in #1760
• Update Exceptions documentations by @RobbeSneyders in #1758
• Fix CLI and drop click dependency by @RobbeSneyders in #1762
• Update cli docs by @RobbeSneyders in #1763
• Remove cookbook docs and sort index better by @RobbeSneyders in #1765
• Update security docs by @RobbeSneyders in #1764
• Add gunicorn with uvicorn workers to docs by @RobbeSneyders in #1766
• Import WSGIDecorator under connexion.decorators by @RobbeSneyders in #1768
• Add new authors' copyright notice by @RobbeSneyders in #1770
• Improve JSON req error on disallowed empty body by @uranusjr in #1761
• Update readme by @RobbeSneyders in #1769
• Update v3 documentation for release by @RobbeSneyders in #1771
• Switch back from py-swagger-ui to swagger-ui-bundle by @RobbeSneyders in #1756
• Convert README from rst to md by @RobbeSneyders in #1772
• Fix images on PyPI by @RobbeSneyders in #1773

New Contributors

• @jacobstanly89 made their first contribution in #1544
• @bluebrown made their first contribution in #1552
• @thvu11 made their first contribution in #1556
• @chibacchie made their first contribution in #1584
• @jayvdb made their first contribution in #1586
• @leonardofesta made their first contribution in #1568
• @gaetano-guerriero made their first contribution in #1601
• @enerqi made their first contribution in #1611
• @rkrishnasanka made their first contribution in #1645
• @opheron made their first contribution in #1677
• @marcin-lulek-cint made their first contribution in #1704
• @julienschuermans made their first contribution in #1713
• @afuetterer made their first contribution in #1740
• @uranusjr made their first contribution in #1761

Full Changelog: 2.13.0...3.0.0