You can get rid of upload URL altogether by writing a little bit of
custom code on your server. Java guide:
http://code.google.com/appengine/docs/java/blobstore/overview.html#Writing_Files_to_the_Blobstore

I urge you to use this solution, it involves with much fewer moving
parts. Cleaner and easier to maintain.

On Jan 3, 11:11 pm, Stuart Langley <[email protected]> wrote:
> The 10 minute limit is in part a measure to prevent against DOS attacks to
> the upload url that is generated.
>
> The scenario you have described is usually handled by using some javascript
> to create the upload URL on demand when the user is ready to submit the
> form.
>
> Work is being undertaken to provide a more descriptive error rather than
> just redirecting to the temporary blobstore error URL.
>
> You could probably
> starhttp://code.google.com/p/googleappengine/issues/detail?id=6313if
> being able to redirect to a specific URL on upload failures as well.

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