# Handler裝飾器
Sanic的handler就是簡單的Python方法，可以像Flask一樣應用裝飾器。典型的應用場景是用在handler代碼運行前/后運行自己的代碼。裝飾器方法必須用`async`定義
```py
from functools import wraps
def decorate_handler(method):
@wraps(method)
async def _deco(request, *args, **kwargs):
print('\ndecorator\n')
response = await method(request, *args, **kwargs)
return response
return _deco
@app.route('/tag/<tag:[0-9]+>', methods=frozenset({'GET'}))
@decorate_handler
async def handler1(request, tag):
return response.json({'tag': tag})
```
