app.py~

# app.py

import os

from flask import Flask, jsonify

app = Flask(__name__)


@app.route('/')
def sample():
    return jsonify(
        message=f'This is the {os.environ["APP"]} application.',
        server=request.base_url,
    )

@app.route('/healthcheck')
def healthcheck():
    return 'OK'

if __name__ == '__main__':
    app.run(host='0.0.0.0')