old_contents: import os
  
  from flask import Flask
  app = Flask(__name__)
  
  
  @app.route("/")
  def hello():
      return "Hello 0-downtime %s World!" % os.environ.get('BLUEGREEN', 'bland')
  
new_contents: import os
  
  from flask import Flask, send_from_directory
  app = Flask(__name__)
  
  
  @app.route("/")
  def hello():
      return "Hello 0-downtime %s World!" % os.environ.get('BLUEGREEN', 'bland')
  
  
  @app.route("/parrots/<path:path>")
  def parrot(path):
      return send_from_directory(os.path.join('parrots', 'parrots'), path)
  
subject: Add a route to send parrot images