Cross Origin Problem with Flask Api (Access-Control-Allow-Origin)

Update requirements.txt file to include Flask-CORS and install the requirements

Flask
Flask-CORS

Enable CORS globally, with permissive configurations

CORS(app)

curl command to test the configuration

$ curl -v -X OPTIONS 
    http://localhost:5000/hello

Configure Access-Control-Allow-Origin option

api_v1_cors_config = {
  "origins": ["http://localhost:5000"]
}
CORS(app, resources={"/api/v1/*": api_v1_cors_config})

curl command to test the configuration

$ curl -v -X OPTIONS 
    -H "Origin: http://localhost:5000" 
    http://localhost:5000/api/v1/hello