code: def launch(app):
      http_server = WSGIServer(("", app.config["XCESSIV_PORT"]), app)
      webbrowser.open_new(
          "http://localhost:" + str(app.config["XCESSIV_PORT"])
      )
      http_server.serve_forever()
  
imports: from __future__ import absolute_import, print_function, division, unicode_literals
  from gevent.wsgi import WSGIServer
  import webbrowser
label_desc: Use image node_id 1 for calling a global function with example usage: launch(app) without return types