code: def spawn_server_api(api_name, app, api_spec, error_callback, decorator):
      
  
      def mycallback(endpoint):
          handler_func = get_function(endpoint.handler_server)
  
          # Generate api endpoint around that handler
          handler_wrapper = _generate_handler_wrapper(api_name, api_spec, endpoint, handler_func, error_callback, decorator)
  
          # Bind handler to the API path
          log.info("Binding %s %s ==> %s" % (endpoint.method, endpoint.path, endpoint.handler_server))
          endpoint_name = '_'.join([endpoint.method, endpoint.path]).replace('/', '_')
          app.add_url_rule(endpoint.path, endpoint_name, handler_wrapper, methods=[endpoint.method])
  
  
      api_spec.call_on_each_endpoint(mycallback)
  
      # Add custom error handlers to the app
      add_error_handlers(app)
docs: Take a a Flask app and a swagger file in YAML format describing a REST
      API, and populate the app with routes handling all the paths and methods
      declared in the swagger file.
  
      Also handle marshaling and unmarshaling between json and object instances
      representing the definitions from the swagger file.