old_contents: '''
  Created on Nov 4, 2016
  
  @author: kelvinzhang
  '''
  import os
  
  from flask import Flask
  from flask import send_from_directory
  
  
  app = Flask(__name__)
  
  @app.route('/<path:path>')
  def catch_all(path):
      return send_from_directory('/', path);
  
  if __name__ == '__main__':
      os.chdir('..')
      app.run(host='0.0.0.0', port='80')
new_contents: '''
  Created on Nov 4, 2016
  
  @author: kelvinzhang
  '''
  import os
  
  from flask import Flask
  from flask import send_from_directory
  
  
  app = Flask(__name__)
  
  @app.route('/<path:path>')
  def catch_all(path):
      return send_from_directory('/', path);
  
  if __name__ == '__main__':
      os.chdir('..')
      app.debug = True
      app.run(host='0.0.0.0', port=80)
subject: enable debug