FlaskApp server not working with uvicorn reload option enabled

[kakuche]

Description

When trying to run a development server for a Flask api the uvicorn reloader appears to duplicate the api route definitions, causing the error shown below. The server runs normally as long as the automatic reloader is disabled.

Since this is my first attempt at api development there's a good chance I simply missed some necessary settings, so any feedback is appreciated.

Expected behaviour

Update of the development server on code changes to .py files.

Actual behaviour

Running the development server with uvicorn and reload=True argument causes the following error on startup:

AssertionError: View function mapping is overwriting an existing endpoint function: index

This triggers either on the first route defined with an @app.route() decorator, or the server url in the openapi specification when no additional routes are defined with the decorator.

Steps to reproduce

install connexion with pip install connexion[flask,uvicorn,swagger-ui]

create app as follows and attempt to run

import pathlib
from connexion import App

basedir = pathlib.Path(__file__).parent.resolve()
app = App(__name__, specification_dir=basedir)
app.add_api(basedir / "openapi.yml")

@app.route("/")
def index():
    return "something"

if __name__ == "__main__":

    app.run(f"{Path(__file__).stem}:app", host="127.0.0.1", port=8000, reload=True)

Additional info:

Output of the commands:

• python --version: Python 3.11.5
• pip show connexion | grep "^Version\:": Version 3.0.6