I'm Java-guy...
...so I would 'route' the uploads to my own request in which I would check
what 'content-length' header of the incoming request contains. If it
exceeded the limit I would reject that request by sending proper HTTP-status
and returning without fetching the post data. If the content-length was OK I
would call createUploadUrl and either a) forwarded the request to that
address, which is easier or b) open a URLConnection and copy the POST-data
data into it, which lets you write to response.
This is how I actually do it on my app, save for the content-length check as
I don't let upload anyone else..

On Mon, May 10, 2010 at 5:58 PM, Massimiliano <
[email protected]> wrote:

> how I can reject the upload? I don't want to start the upload, but display
> a message error.
>
> Massimiliano
>
> 2010/5/10 Jaroslav Záruba <[email protected]>
>
> 1) Enabling billing does not mean your free quote goes away. I have billing
>> enabled and I'm still in "a free mode". (I'm still in the dev. phase with my
>> project anyways.)
>>
>> 2) As for limiting uploads: You can hide the uploadUrl behind your own
>> servlet and reject uploads over limit within it. Or you can let user upload
>> whole file and delete it in the successUrl-servlet afterwards.
>>
>> Regards
>>   J. Záruba
>>
>> On Mon, May 10, 2010 at 5:45 PM, Massimiliano <
>> [email protected]> wrote:
>>
>>> Dear all,
>>> first of all: *"**You must have billing enabled in your app to use the
>>> Blobstore." *Is this still true? Is my free quota 1 giga?
>>> I don't want to enable billing, as this is a hobby, I'm not an IT.
>>>
>>> Second I want my users to upload image, but I want to limit them with
>>> file not lager than a specific quota. How can I do this?
>>>
>>> Regards
>>>
>>> Massimiliano
>>>
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>
>
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