Error running uv sync in ./backend/

[thiagonsiq]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched in the documentation/README.
• I already searched in Google "How to do X" and didn't find any information.
• I already read and followed all the tutorial in the docs/README and didn't find an answer.

Commit to Help

• I commit to help with one of those options 👆

Example Code

I haven't been able to run the backend code, in order to try to use the FastAPI endpoints. 
uv sync does not work

Description

I haven't been able to run the backend code, in order to try to use the FastAPI endpoints.
uv sync does not work. I see the following error:

Resolved 80 packages in 1ms x Failed to build httptools==0.6.1|-> The build backend returned an error-> Call to setuptools.build_meta:__legacy__.build_wheel failed (exit code: 1)

  [stdout]
  running bdist_wheel
  running build
  running build_py
  copying httptools\_version.py -> build\lib.win-amd64-cpython-313\httptools
  copying httptools\__init__.py -> build\lib.win-amd64-cpython-313\httptools
  copying httptools\parser\errors.py -> build\lib.win-amd64-cpython-313\httptools\parser
  copying httptools\parser\__init__.py -> build\lib.win-amd64-cpython-313\httptools\parser
  running egg_info
  writing httptools.egg-info\PKG-INFO
  writing dependency_links to httptools.egg-info\dependency_links.txt
  writing requirements to httptools.egg-info\requires.txt
  writing top-level names to httptools.egg-info\top_level.txt
  reading manifest file 'httptools.egg-info\SOURCES.txt'
  reading manifest template 'MANIFEST.in'
  adding license file 'LICENSE'
  writing manifest file 'httptools.egg-info\SOURCES.txt'
  running build_ext
  building 'httptools.parser.parser' extension

  [stderr]
  C:\Users\thiag\AppData\Local\uv\cache\builds-v0\.tmpURIgRD\Lib\site-packages\setuptools\_distutils\dist.py:289:      UserWarning: Unknown distribution option: 'test_suite'
    warnings.warn(msg)
  C:\Users\thiag\AppData\Local\uv\cache\builds-v0\.tmpURIgRD\Lib\site-packages\setuptools\dist.py:759:
  SetuptoolsDeprecationWarning: License classifiers are deprecated.
  !!

          ********************************************************************************
          Please consider removing the following classifiers in favor of a SPDX license expression:

          License :: OSI Approved :: MIT License

          See https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#license for details.
          ********************************************************************************

  !!
    self._finalize_license_expression()
  C:\Users\thiag\AppData\Local\uv\cache\builds-v0\.tmpURIgRD\Lib\site-packages\setuptools\command\build_py.py:212:
  _Warning: Package 'httptools.parser' is absent from the `packages` configuration.
  !!

          ********************************************************************************
          ############################
          # Package would be ignored #
          ############################
          Python recognizes 'httptools.parser' as an importable package[^1],
          but it is absent from setuptools' `packages` configuration.

          This leads to an ambiguous overall configuration. If you want to distribute this
          package, please make sure that 'httptools.parser' is explicitly added
          to the `packages` configuration field.

          Alternatively, you can also rely on setuptools' discovery methods
          (for example by using `find_namespace_packages(...)`/`find_namespace:`
          instead of `find_packages(...)`/`find:`).

          You can read more about "package discovery" on setuptools documentation page:

          - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html

          If you don't want 'httptools.parser' to be distributed and are
          already explicitly excluding 'httptools.parser' via
          `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
          you can try to use `exclude_package_data`, or `include-package-data=False` in
          combination with a more fine grained `package-data` configuration.

          You can read more about "package data files" on setuptools documentation page:

          - https://setuptools.pypa.io/en/latest/userguide/datafiles.html


          [^1]: For Python, any directory (with suitable naming) can be imported,
                even if it does not contain any `.py` files.
                On the other hand, currently there is no concept of package data
                directory, all directories are treated like packages.
          ********************************************************************************

  !!
    check.warn(importable)
  error: Microsoft Visual C++ 14.0 or greater is required. Get it with "Microsoft C++ Build Tools":
  https://visualstudio.microsoft.com/visual-cpp-build-tools/

  hint: This usually indicates a problem with the package or the build environment.

help: httptools (v0.6.1) was included because app (v0.1.0) depends on fastapi[standard] (v0.115.0) which
depends on uvicorn[standard] (v0.30.6) which depends on `httptools``

Operating System

Windows

Operating System Details

Windows 11

Python Version

3.13.2

Additional Context

No response

[thiagonsiq]

By the way, I did install Microsoft C++ Build Tools and tried running again (after a computer restart), to no avail.

[agorecki]

Downgrading Python to 3.10 fixed this for me.

[jamesuther-ow]

Yes it seems to be a problem in 3.13. 3.12 works. httptools needs to fix it upstream.