The Blobstore tutorial gives an example only for this use case. This link provides this code: an application that allows users to upload files and then immediately upload them:
#!/usr/bin/env python # import os import urllib from google.appengine.ext import blobstore from google.appengine.ext import webapp from google.appengine.ext.webapp import blobstore_handlers from google.appengine.ext.webapp import template from google.appengine.ext.webapp.util import run_wsgi_app class MainHandler(webapp.RequestHandler): def get(self): upload_url = blobstore.create_upload_url('/upload') self.response.out.write('<html><body>') self.response.out.write('<form action="%s" method="POST" enctype="multipart/form-data">' % upload_url) self.response.out.write("""Upload File: <input type="file" name="file"><br> <input type="submit" name="submit" value="Submit"> </form></body></html>""") class UploadHandler(blobstore_handlers.BlobstoreUploadHandler): def post(self): upload_files = self.get_uploads('file') # 'file' is file upload field in the form blob_info = upload_files[0] self.redirect('/serve/%s' % blob_info.key()) class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler): def get(self, resource): resource = str(urllib.unquote(resource)) blob_info = blobstore.BlobInfo.get(resource) self.send_blob(blob_info) def main(): application = webapp.WSGIApplication( [('/', MainHandler), ('/upload', UploadHandler), ('/serve/([^/]+)?', ServeHandler), ], debug=True) run_wsgi_app(application) if __name__ == '__main__': main()