This demonstrates how to run a local development server which uses a different configuration based on the subdomain of the request. It creates a separate instance of the app per subdomain. See here for more information: http://flask.pocoo.org/docs/patterns/appdispatch/#dispatch-by-subdomain

1. Add the following to your hosts file (/etc/hosts on Ubuntu):

    0.0.0.0 dev.localhost
    0.0.0.0 qa.localhost
   

2. Install Flask

    virtualenv venv
    source venv/bin/activate
    pip install Flask==0.10.1
   

3. Run the local development server

    python subdomainexample.py
   

4. Visit the following URLs in the browser:

   • http://localhost:5000/
   • http://dev.localhost:5000/
   • http://qa.localhost:5000/