code: def after_request(response):
      
      response.headers.add('Access-Control-Allow-Origin', '*')
      response.headers.add('Access-Control-Allow-Headers', 'Content-Type,Authorization')
      response.headers.add('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE')
      return response
docs: Modifies the response object prior to sending it to the client. Used to add CORS headers to the request
  
      Args:
          response (response): Flask response object
  
      Returns:
          `None`