old_contents: from sanic import Sanic
  from sanic.response import json
  
  app = Sanic(__name__)
  
  @app.route("/")
  async def test(request):
      return json({"hello": "world"})
  
  app.run(host="0.0.0.0", port=4321)
  
new_contents: from sanic import Sanic
  from sanic.response import json
  
  app = Sanic(__name__)
  
  # Static file serving
  # TODO: static file serving need to be used only in debug mode
  app.static('/', './public/index.html')
  app.static('*', './public')
  
  app.run(host="0.0.0.0", port=4321)
  
subject: Enable static file serving