Mockup Python-baased Google Cloud Function

.env

# On local environemnt: loaded via python-dotenv.
# On Cloug FUnction: defined on Environment Variables section and automatically loaded for the Cloud Function.
DEFAULT_MESSAGE="You haven't provided a message."

main.py

""" Cloud Function. """
import os                                                                       
                                                                                
def hello_world(request):                                                       
    """Responds to any HTTP request.                                            
    Args:                                                                       
        request (flask.Request): HTTP request object.                           
    Returns:                                                                    
        The response text or any set of values that can be turned into a        
        Response object using                                                   
        `make_response <http://flask.pocoo.org/docs/1.0/api/#flask.Flask.make_response>`.
    """                                                                         
    request_json = request.get_json()                                           
    if request.args and 'message' in request.args:                              
        return request.args.get('message')                                      
    elif request_json and 'message' in request_json:                            
        return request_json['message']                                          
    else:                                                                       
        default_message = os.getenv('DEFAULT_MESSAGE')                          
        return f'{default_message}' 

mockup_main.py

""" Designed for mockup purposes of Google Cloud Function from main.py. """        
import sys                                                                      
                                                                                
from flask import Flask, request                                                
from dotenv import load_dotenv, find_dotenv                                     
                                                                                
from main import hello_world                                                    
                                                                                
app = Flask(__name__)                                                           
                                                                                
@app.route('/', methods=['GET', 'POST'])                                        
def respond():                                                                  
    return hello_world(request)                                                 
                                                                                
if __name__ == "__main__":                                                      
    """                                                                         
                                                                                
   S ome cURL commands for simulation purposes:                                 
                                                                                
        curl http://127.0.0.1:5000/                                             
        curl http://127.0.0.1:5000/?message="wakeup%20now"                                                      
        curl http://127.0.0.1:5000/ -X POST -H "Content-Type: application/json" -d '{"message":"wakeup"}'
    """                                                                         
    # Loading environment variables from .env                                   
    ENV_FILE = find_dotenv()                                                    
    if ENV_FILE:                                                                
        load_dotenv(ENV_FILE)                                                   
    else:                                                                       
        print("[ERROR]: no .env file was found.")                               
        sys.exit()                                                              
                                                                                
    app.run()

requirements.txt

click==7.1.2
Flask==1.1.2
itsdangerous==1.1.0
Jinja2==2.11.2
MarkupSafe==1.1.1
python-dotenv==0.14.0
Werkzeug==1.0.1