Flask decorator for just caching and not caring about anything else

justcache.py

import hashlib
from flask import request, make_response, Response
import datetime
from functools import wraps

def just_cache(f):
    @wraps(f)
    def _wrap(*args, **kwargs):
        if 'If-Modified-Since' in request.headers:
            return Response(status=304)
        data = f(*args, **kwargs)
        resp = make_response(data, 200)
        resp.headers.add('Last-Modified', datetime.datetime(2013,9,1))
        resp.headers.add('Expires', datetime.datetime(2013,9,1) + datetime.timedelta(seconds=315360000))
        resp.headers.add('Cache-Control', 'public, max-age=315360000')
        resp.headers.add('ETag', hashlib.sha1(data).hexdigest())
        return resp
    return _wrap