Document breaking change that underlying Flask app can no longer be run directly.

[tariqjamal-abdulazeez]

Description

When using connexion and flask with the below version

Name: Flask
Version: 3.0.0

Name: connexion
Version: 3.0.1

Code

app.py code
import connexion
def post_greeting(name: str) -> str:
return f"Hello {name}"

api = connexion.FlaskApp(name, specification_dir="specs/")
api.add_api("openapi.yml", arguments={"title": "Hello World Example"})
app = api.app

openapi.yml

openapi.yml

openapi: 3.0.0
info:
title: Hello World Example
version: "1.0"
servers:

• url: /api
  description: Development API Location
  paths:
  /post_greeting:
  get:
  summary: Get a greeting
  parameters:
  - name: name
  in: query
  schema:
  type: string
  description: Name to be used in the greeting
  responses:
  '200':
  description: OK
  content:
  application/json:
  schema:
  type: object
  properties:
  message:
  type: string

Actual behaviour

`During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/werkzeug/serving.py", line 362, in run_wsgi
execute(self.server.app)
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/werkzeug/serving.py", line 323, in execute
application_iter = app(environ, start_response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/flask/app.py", line 1478, in call
return self.wsgi_app(environ, start_response)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/flask/app.py", line 1458, in wsgi_app
response = self.handle_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/flask/app.py", line 1455, in wsgi_app
response = self.full_dispatch_request()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/flask/app.py", line 869, in full_dispatch_request
rv = self.handle_user_exception(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/flask/app.py", line 759, in handle_user_exception
return self.ensure_sync(handler)(e)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/tariqjamal/anaconda3/envs/reflex-apps/lib/python3.11/site-packages/connexion/apps/flask.py", line 245, in _http_exception
raise starlette.exceptions.HTTPException(exc.code, detail=exc.description)
starlette.exceptions.HTTPException: 404
`

@spec-first
@RobbeSneyders @Ruwann Like this in another project i'm getting the error

raise NotFound() from None

werkzeug.exceptions.NotFound: 404 Not Found: The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.

[RobbeSneyders]

Hi @tariqjamal-abdulazeez, how are you running the application? You should run the Connexion application directly, not the underlying Flask application.

[shariqueakbare]

@tariqjamal-abdulazeez how to achieve that because i have exactly the same issue !

[nickzandbergen]

I had a similar issue after upgrading from 2.14.0 and using connexion's FlaskApp instead of the Flask application fixed it.

[RobbeSneyders]

Check this discussion for more info #1795

[tariqjamal-abdulazeez]

I had a similar issue after upgrading from 2.14.0 and using connexion's FlaskApp instead of the Flask application fixed it.

I had a similar issue after upgrading from 2.14.0 and using connexion's FlaskApp instead of the Flask application fixed it.

@

Hi @tariqjamal-abdulazeez, how are you running the application? You should run the Connexion application directly, not the underlying Flask application.

@RobbeSneyders I tried that also but it does not work for me

[tariqjamal-abdulazeez]

I had a similar issue after upgrading from 2.14.0 and using connexion's FlaskApp instead of the Flask application fixed it.

@nickzandbergen I need to achieve this thing in connexion latest version, but using the connexion latest docs with flask version 3.0 it not working properly

[tariqjamal-abdulazeez]

@RobbeSneyders Could you write a documentation for migration step by step ? because really i'm not able to make it works with the new version

[RobbeSneyders]

It's hard to write a general guide since users were using Connexion in many different ways. We spent a great amount of effort to update and improve our documentation for Connexion 3. Please try to use it to find your answers there.

If you run into specific errors, you can open an issue explaining the error and we can support on that error specifically. If we notice any gaps in our documentation based on these issues, we will update it.

[tariqjamal-abdulazeez]

It's hard to write a general guide since users were using Connexion in many different ways. We spent a great amount of effort to update and improve our documentation for Connexion 3. Please try to use it to find your answers there.

@RobbeSneyders Previously i had working with flask=2.2.5 and connexion = 2.14.2 with this configuration the application request are correctly but due to some dependency i had upgraded the both package to their latest version, but in that the request are correctly getting in server and flask before_request is executed after then when it try to match the url with openapi duing that getting the issue

I had tried all possible according to the docs but it doesn't work for me

[tianjing-li]

I actually have the same configuration as @tariqjamal-abdulazeez and trying to figure out how to upgrade to [email protected].

Here's how my Flask app entrypoint looks like:

def create_app() -> connexion.FlaskApp:
    app = connexion.FlaskApp(__name__, specification_dir="../../openapi/")
    app.add_api(
        API_VERSION,
        resolver=connexion.resolver.RelativeResolver("provider.app"),
    )
    logging.basicConfig(level=logging.INFO)
    flask_app = app.app
    config_prefix = os.path.split(os.getcwd())[
        1
    ].upper()  # Current directory name, upper-cased
    flask_app.config.from_prefixed_env(config_prefix)
    return flask_app

I also use poetry as a package dependency manager, and run the server with poetry run flask --app provider --debug run, but I can see from the above that we can't run the flask server directly but instead need to use Connexion? Is this achieved by using uvicorn? Ie: I will need to add uvicorn as a dependency and then use that for starting the server