old_contents: import picoweb
  from sta import model
  from util import handler, ok
  
  def get(req, res):
    yield from ok(res, model.get())
  
  def set(req, res):
    yield from req.read_form_data()
    model.set(req.form)
    yield from ok(res)
  
  def scan(req, res):
    nets = model.scan()
    yield from ok(res, nets)
  
  def crud(req, res):
    ret = {
      'GET': get,
      'PUT': set
    }
    yield from ret[req.method](req, res)
  
new_contents: from sta import model
  from util import handler, ok
  
  def get(req, res):
    yield from ok(res, model.get())
  
  def set(req, res):
    yield from req.read_form_data()
    model.set(req.form)
    yield from ok(res)
  
  def scan(req, res):
    nets = model.scan()
    yield from ok(res, nets)
  
  def crud(req, res):
    ret = {
      'GET': get,
      'PUT': set
    }
    yield from ret[req.method](req, res)
  
subject: remove unused picoweb