Example for Blobstore Upload brokenness

app.yaml

runtime: python27
api_version: 1
threadsafe: yes
service: upload-test

handlers:
- url: .*
  script: main.app

libraries:
- name: webob
  version: "1.2.3"

main.py

from google.appengine.api import users
from google.appengine.ext import blobstore
from google.appengine.ext import ndb
from google.appengine.ext.webapp import blobstore_handlers
import logging
import webapp2


# This datastore model keeps track of which users uploaded which photos.
class UserPhoto(ndb.Model):
    user = ndb.StringProperty()
    blob_key = ndb.BlobKeyProperty()


class PhotoUploadFormHandler(webapp2.RequestHandler):
    def get(self):
        # [START upload_url]
        upload_url = blobstore.create_upload_url('/upload_photo')
        # [END upload_url]
        # [START upload_form]
        # To upload files to the blobstore, the request method must be "POST"
        # and enctype must be set to "multipart/form-data".
        self.response.out.write(upload_url)
        # [END upload_form]


# [START upload_handler]
class PhotoUploadHandler(blobstore_handlers.BlobstoreUploadHandler):
    def post(self):
        import pdb; pdb.set_trace()
        try:
            upload = self.get_uploads()[0]
            user_photo = UserPhoto(
                user=users.get_current_user().user_id(),
                blob_key=upload.key())
            user_photo.put()

            self.redirect('/view_photo/%s' % upload.key())

        except:
            logging.exception('Error!')
            self.error(500)
# [END upload_handler]


# [START download_handler]
class ViewPhotoHandler(blobstore_handlers.BlobstoreDownloadHandler):
    def get(self, photo_key):
        if not blobstore.get(photo_key):
            self.error(404)
        else:
            self.send_blob(photo_key)
# [END download_handler]


app = webapp2.WSGIApplication([
    ('/', PhotoUploadFormHandler),
    ('/upload_photo', PhotoUploadHandler),
    ('/view_photo/([^/]+)?', ViewPhotoHandler),
], debug=True)

upload.py

21:44 $ cat upload.py 
# -*- coding: utf-8 -*-
import requests
import sys

response = requests.get(sys.argv[1])
upload_url = response.content
response = requests.post(upload_url, files={'file': (u'línea.csv', 'test', 'text/csv')})
print(response.content)