Conclusion

Fenrir provides a powerful and flexible framework that combines the best features from multiple Python web frameworks. Whether you prefer FastAPI's validation, Flask's simplicity, Falcon's performance, or Sanic's async features, Fenrir allows you to use them all together seamlessly.

For more information, visit: https://github.com/IshikawaUta/fenrir

Happy coding! 🐺

Release Notes & Changelog

v1.2.2 — Logo & Favicon Patch

High-quality logo assets and resolved CLI template favicon issues:

High-Resolution Logo: Updated logo.png asset to a high-fidelity image for sharper rendering in documentation and templates.
Favicon Resolution: Ensured favicon is correctly rendered and copied during project scaffolding (fenrir new) from the package assets.

v1.2.1 — Packaging & Asset Integration Patch

Logo and favicon assets are now properly included in the package distribution:

Logo Asset Packaging - Issue: fenrir new command failed to copy logo and favicon files when creating new projects outside the main repository. - Root cause: Logo files (logo.png, logo.jpg) were stored in the repository root, not within the fenrir/ package directory, so they were not included when the package was installed via PyPI. - Fix: - Moved logo.png and logo.jpg from repository root to fenrir/ package directory. - Added [tool.setuptools.package-data] configuration in pyproject.toml to include image files: fenrir = ["logo.png", "logo.jpg"]. - Updated fenrir/cli.py cmd_new() function to look for logos in the fenrir package directory first, with fallbacks for development mode. - Result: All tests pass (482 unit tests + 13 advanced tests). fenrir new now works correctly in all environments.

v1.1.1 — Python 3.8–3.10 Full Compatibility Patch

Five test failures on Python 3.8 CI were identified and patched:

1. RuntimeError: Working outside of request context (session, redirect in sync handlers) - Root cause: loop.run_in_executor() does not propagate contextvars by default. Sync route handlers using session[...] or redirect() lost the request context when moved into the executor thread. - Fix: fenrir/compat.py — polyfill now calls contextvars.copy_context().run(func) instead of passing func directly to the executor.

2. AssertionError: {'user': None} != {'user': 'Alice'} (Annotated[str, Header()]) - Root cause: typing.get_origin(typing_extensions.Annotated[...]) returns None on Python 3.8, so Annotated parameters were silently ignored during dependency resolution. - Fix: fenrir/compat.py — export get_origin/get_args from typing_extensions (which correctly handles its own Annotated). fenrir/dependencies.py and fenrir/openapi.py now import these from fenrir.compat.

3. AssertionError: {'content_type': ''} != {'content_type': 'text/plain'} (file upload) - Root cause: python-multipart < 0.0.21 (installed on Python 3.8–3.10 CI runners) did not pass content_type into File.__init__, so file.content_type did not exist. - Fix: fenrir/request.py — intercepts the parser's on_header_field/on_header_value/on_headers_finished callbacks to capture the Content-Type of each multipart part before the File object is constructed, and injects it as a fallback.

4. AssertionError: 'target' == '/nested/target' (relative redirect) - Resolved as a side-effect of fix #1 (contextvars propagation restores request.path inside the executor thread).

5. CI timeout on Python 3.9 (gevent build) - The Python 3.9 job was cancelled mid-build because compiling gevent took too long. This is an infrastructure concern, not a code issue; no code change required.

v1.1.0 — CI/CD & Centering Fix

Added GitHub Actions workflow for automated testing across Python 3.8–3.13.
Fixed centering of PROJECT CREATED SUCCESSFULLY badge and logo in scaffolded template.
Added RFC 7231 HEAD method compliance.
Added itsdangerous and python-multipart as explicit core dependencies.

v0.1.0 — Initial Release

Core ASGI framework with Flask, FastAPI, Sanic, Falcon, and Bottle hybridization.
482 automated unit tests.
Premium CLI tooling (run, routes, shell, bench, new, info).
Auto-generated OpenAPI/Swagger documentation.
WebSocket and Server-Sent Events support.