Not getting any response if response validation fails.

[gaurav-triverus]

Description

when application has a validation error in response, it doen't send response. In the below example my response data from application code doesn't match with the schema defined in openAPI. I can see it goes in the JSONResponseBodyValidator and raises NonConformingResponseBody in the application but doesn't send back the response.

Expected behaviour

Response validation propagates the exception up

Actual behaviour

The app hangs forever and never recieves the response.

Steps to reproduce

This is how I am configuring my application

def create_app():
    options = SwaggerUIOptions(swagger_ui_path="/docs")
    validator_map = validation.get_custom_validator_map()
    app = connexion.FlaskApp(
        __name__, specification_dir=get_project_root_dir(), 
        swagger_ui_options=options,
    )
    app.add_api(
        'openapi.yaml',
        swagger_ui_options=options,
        strict_validation=True,
        validate_responses=True,
    )
    flask_app = app.app
    @flask_app.before_request
    def push_db():
        print('test app --> in before request ')

    @flask_app.teardown_request
    def close_db(exception=None):
        print('test app--> in teardown request')

    @flask_app.after_request
    def access_log_end(response):
        print('test app--> in after request', response.data)
        return response
    
    app.run(host = "0.0.0.0",
            port=5000,
            )
    # app.run(debug=True, host="0.0.0.0")

OpenApi has the successful response schema. The schema has a field data with type array or objct. In my response if I am passing None in data. I am getting validation error within the application but never recieves the response back.
OpenAPI -

openapi: 3.0.0
info:
  title: Sample API
  version: 1.0.0
paths:
  /health:
    get:
      security:
        - {}
      # security:
      #   - jwt: []
      summary: hellow world
      description: hellow world
      operationId: handlers.health.health
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/SuccessfulResponse"

components:
  securitySchemes:
    jwt:
      type: http
      scheme: bearer
      bearerFormat: JWT
      x-bearerInfoFunc: application.app.decode_jwt

  schemas:
    SuccessfulResponse:
      type: object
      properties:
        status_code:
          type: integer
        message:
          type: string
        meta:
          $ref: "#/components/schemas/Meta"
        data:
          oneOf:
            - type: array
            - type: object
        warnings:
          type: array
          items:
            type: string
        errors:
          type: array
          items:
            type: string
      required: ["status_code"]
      additionalProperties: false

    Meta:
      type: object
      properties:
        resource:
          type: string
        method:
          type: string
        query:
          type: object
      required: ["resource", "method"]
      additionalProperties: false

below is the application code that sends the response (Please not I am sending None in data which is defined as array or object in openApi_ -

def health():
    print('health check')
    return response_util.success_response(
        message="flask and dbt health check",
        data=None,
        errors=response_error,
        status_code=200,
    ).to_api_response() 

Additional info:

Output of the commands:

• python --version
  Python 3.9.18
• pip show connexion | grep "^Version\:"
  Name: connexion
  Version: 3.0.5
  Summary: Connexion - API first applications with OpenAPI/Swagger
  Home-page: https://github.com/spec-first/connexion
  Author: Robbe Sneyders
  Author-email: robbe.sneyders@gmail.com
  License: Apache-2.0
  Location: /usr/local/lib/python3.9/site-packages
  Requires: asgiref, httpx, inflection, Jinja2, jsonschema, python-multipart, PyYAML, requests, starlette, typing-extensions, werkzeug
  Required-by: