I've found a solution here: 
http://stackoverflow.com/questions/7476420/gwt-blobstore-error-calling-createuploadurl
Just use your computer name in dev mode instead of 127.0.0.1. In FF
you will be asked for adding this name to GWT dev plugin automaticly
and in Chrome you must do it yourself (as it is described at
stackoverflow), I dont't know about IE.
I'm developing my app quite a while and I didn't have this problem
before. Some lib upgrade (GAE/GWT/GPE ?) to the new version must had
caused it.
I'm wondering, since I didn't try my app on the production, if there
will be some cross-domain problems when the app is deployed on GAE and
is using Blobstore URLs...

Regards,
Krzysztof

On Sep 30, 10:09 pm, David Edelstein <[email protected]> wrote:
> When using BlobStoreService.createUploadUrl("/upload") in development
> mode in Eclipse wht the GWT plug-in I am having the following
> problem.
>
> BlobStoreService.createUploadUrl("/upload") creates a URL with the
> computer name as the domain (i.e. comp-4532:8888).
>
> However, the GWT plug-in is running the server in hosted mode with the
> domain 127.0.0.1:8888. I believe this is resulting in the URL being
> null when it is returned to the forms SubmitCompleteHandler. It thinks
> it's a cross domain request and nulling it out?
>
> Does anyone else have this issue? Any idea what I'm doing wrong?
>
> Thanks!

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