This seems very closely related to:
http://groups.google.com/group/google-appengine-python/browse_thread/thread/879821e0d91a61e7#

On Sep 2, 11:25 am, John Boxall <[email protected]> wrote:
> Hey AppEnginites,
>
> I'm trying to programatically uploading blobs to the datastore from my
> application via a handler that constructs a POST request when its hit:
>
> class PostHandler(webapp.RequestHandler):
>     def get(self):
>         upload_url = blobstore.create_upload_url('/upload_photo')
>         u = urlparse.urlparse(upload_url)
>         data = open('image.jpg').read()
>         response = post_multipart(u.netloc, u.path, [],
> files=[('file', 'image.jpg', data)])
>         self.redirect(response.getheader('location'))
>
> On the dev server this times out because it can only handle a single
> request at a time - and this handler spawns a second request to the
> application.
>
> However it's also failing on AppEngine itself with a "DownloadError:
> ApplicationError: 5" exception.
>
> Is it not possible to programatically upload blobs?
>
> Cheers,
>
> John

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