text: from flask import Flask
  from .proxyapp import proxyapp
  
  
  def create_app(test_config=None):
      """Create and configure an instance of the Flask application."""
      app = Flask(__name__, instance_relative_config=True)
      app.config.from_mapping(
          # a default secret that should be overridden by instance config
          SECRET_KEY='dev')
  
      app.register_blueprint(proxyapp)
      return app
  
  