Image server with Python (Tornado) and MongoDB

__main__.py

# !/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'Diego Garcia'

import tornado.ioloop
import tornado.web
from bson.json_util import dumps
from pymongo import Connection
from bson.objectid import ObjectId
from gridfs import GridFS


class ImageHandler(tornado.web.RequestHandler):
    def initialize(self):
        self.fs = GridFS(Connection()['database'], 'imgs')

    def get(self, img_id):
        image = self.fs.get(ObjectId(img_id))
        self.set_header('Content-type', image.content_type)
        self.set_header('Content-length', image.length)
        self.write(image.read())
        self.finish()

    def post(self):
        image = self.request.files['files'][0]['body']
        tipo = self.request.headers['Content-Type']
        img_id = self.fs.put(image, content_type=tipo)
        self.write(dumps({"img_id": img_id}))
        self.finish()

application = tornado.web.Application([
    (r"/img/?", ImageHandler),
    (r"/img/([^/]+)?", ImageHandler),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()