google app engine; upload to blobstore gives 404 error

Question

I am using GAE with Python 2.7 to make a website which can upload files with ascii data to the blobstore. The code I am using for this is pretty much the same as given in th

Answer 1

The URL that you are getting with create_upload_url() has a certain timeout (which is 10 minutes) so if you are retrieving this URL when the webpage is loaded and it takes a while to upload the actual data it will eventually expire and return 404. I would suggest you to get the upload URL just before uploading the data.