Your steps seem logical but,
Problem is that the some clients are necessary in the browser, so
there is no form to submit.
Those clients needs a "fixed" end point to upload the data (or call a
"fixed" end point that will return the upload url"

On Sep 7, 6:29 pm, timwhunt <timwh...@gmail.com> wrote:
> I think I have this right, so hopefully to clarify:
>
> 1) You get the upload URL for an HTML form for your user to upload the
> image.  Part of forming that uploading URL is to identify the handler
> code (e.g., Servlet in Java)
> 2) Your handler code gets called by the Blobstore after the upload is
> complete and that handler can work with the uploaded data and you'll
> work with the the key for the blob
> 3) Your handler sends a redirect command back to the user's browser
> directing them to the page they need to go to for status/results.
> That redirect URL generally includes a parameter identifying which
> blob upload (it's key) you're dealing with.
> 4) The user's browser is redirected to that page, where your code uses
> the blobstore key (from the URL parameter) to process and in your case
> return the OCR data.
>
> So from the client point of view, they submit a forum with a file
> upload part, and they get redirected to the page that provides the
> results.
>
> Someone please correct if necessary.

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