Failed to load API definition. Errors Hide Fetch errorFailed to fetch /apispec_1.json

[scheung38]

This is app/init.py:

"""Initialize Flask app."""
from flask import Flask, redirect

from flasgger import Swagger
from flask_restful import Api

def create_app():
    """Create Flask application."""
    app = Flask(__name__, instance_relative_config=True)

    with app.app_context():
        from .generator import rss_content_gen_api
        from .version import version_api

        # Register Blueprints
        # app.register_blueprint(content_gen_api.generator_bp)
        app.register_blueprint(rss_content_gen_api.rss_generator_bp)
        app.register_blueprint(version_api.version_bp)

        # # Initialize Swagger
        swag = Swagger(app)

        print("swag :", swag)
        return app

This is my app/version/version_api.py:

from flask import Blueprint, jsonify, request, abort

import os
from pathlib import Path
import logging

from flask_restful import Api, Resource
from flasgger.utils import swag_from

version_bp = Blueprint("version_bp", __name__)

@version_bp.route("/version", methods=["GET"])
@swag_from("versions.yml")
def get_version():
    """Example endpoint returning a list of colors by palette
    This is using docstrings for specifications.
    ---
    parameters:
      - name: palette
        in: path
        type: string
        enum: ['all', 'rgb', 'cmyk']
        required: true
        default: all
    definitions:
      Palette:
        type: object
        properties:
          palette_name:
            type: array
            items:
              $ref: '#/definitions/Color'
      Color:
        type: string
    responses:
      200:
        description: A list of colors (may be filtered by palette)
        schema:
          $ref: '#/definitions/Palette'
        examples:
          rgb: ['red', 'green', 'blue']
    """
    try:
        version_file_path = Path("/home/appuser/version.txt")

        if not version_file_path.exists():
            abort(404, "Version file not found!")

        with version_file_path.open("r") as f:
            version_info = [line.strip() for line in f]

        return jsonify(version_info)

    except Exception as e:
        print(e)


if __name__ == "__main__":
    version_bp.run()

Dockefile at root:

# Use an official Python runtime as a parent image
FROM python:3.9

# Define environment variable
ENV FLASK_APP=run.py
ENV FLASK_PORT 5000
ENV PATH="/home/appuser/.local/bin:${PATH}"

# Create a non-root user and also directory of the same "appuser"
RUN useradd -m appuser

# Set the working directory to /home/appuser
WORKDIR /home/appuser

# Change to non-root user
USER appuser

# Create the log folder
RUN mkdir -p log

# Create the app.log file
RUN touch log/app.log

# Set ownership and permissions for log folder
RUN chown -R appuser:appuser log

# Copy only the requirements.txt first to leverage Docker cache
# This layer is recreated only when requirements.txt changes
COPY --chown=appuser:appuser requirements.txt ./

# Replace the access token placeholder in requirements.txt
ARG GITLAB_ACCESS_TOKEN
RUN pip install --no-cache-dir -r requirements.txt
# --trusted-host pypi.python.org

# Then copy the rest of the application code
# This layer is recreated whenever a file in your project changes
COPY --chown=appuser:appuser . .

# Expose the Flask port to the world
EXPOSE $FLASK_PORT

# Run the command to start the Flask app
CMD flask run --host=0.0.0.0 --port=$FLASK_PORT

Terminal:

docker build --build-arg GITLAB_ACCESS_TOKEN=$GITLAB_ACCESS_TOKEN -t generator:1 .

docker run -p 5001:5000 generator:1

Then:

http://127.0.0.1:5001/apidocs

Parts of requirements.txt:

flasgger==0.9.7.1
Flask==2.3.2
Flask-RESTful==0.3.10

Why am I getting within Insomnia:

app/version/versions.yml:

Get a Version by it's branch and commit hash
---
tags:
  - version
produces:
  - application/json
  - application/xml
parameters:
  - in: path
    name: version_id
    description: ID of the Version to get
    type: integer
    required: true
responses:
  200:
    description: OK
    schema:
      type: string

Logs:

172.17.0.1 - - [01/Jun/2023 19:03:13] "GET /apidocs HTTP/1.1" 308 -
172.17.0.1 - - [01/Jun/2023 19:03:13] "GET /apidocs/ HTTP/1.1" 200 -
172.17.0.1 - - [01/Jun/2023 19:03:14] "GET /flasgger_static/lib/jquery.min.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:14] "GET /flasgger_static/swagger-ui-bundle.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:14] "GET /flasgger_static/swagger-ui.css HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:14] "GET /flasgger_static/swagger-ui-standalone-preset.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:14] "GET /apispec_1.json HTTP/1.1" 200 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /apidocs HTTP/1.1" 308 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /apidocs/ HTTP/1.1" 200 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /flasgger_static/swagger-ui-standalone-preset.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /flasgger_static/swagger-ui.css HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /flasgger_static/lib/jquery.min.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /flasgger_static/swagger-ui-bundle.js HTTP/1.1" 304 -
172.17.0.1 - - [01/Jun/2023 19:03:15] "GET /apispec_1.json HTTP/1.1" 200 -

EDIT:

It works in Chrome browser:

But why inside Insomnia I am still getting the above?

[fn-hide]

same issue