If I'm not missing something obvious, you should also manually, from code, 
block access to routines from *.appspot.com requests, and move one step 
forward and manually whitelist CF IP's at your code

Even if you do all of these, that person will still be able to request 
*.appspot.com/static.file of yours - so I don't think these will solve your 
problem

On Monday, October 28, 2013 7:37:05 AM UTC+2, Vinny P wrote:
>
> On Sun, Oct 27, 2013 at 9:40 PM, Lawrence Mok 
> <[email protected]<javascript:>
> > wrote:
>
>> Yesterday my site is being attacked for the first time causing the reach 
>> of daily budget limit thus a complete stop of the site.
>>
>> Someone from the IP 117.194.36.17 was requesting a 5MB file download 600 
>> times within a short period
>>
>> I know I can blacklist this IP, but is there anything Google can do just 
>> to prevent this from happening in advance, given that this can happen on 
>> any IP?
>>
>
>
> I would recommend Cloudflare's DDOS protection. They have basic DDOS 
> protection measures available on their free plan, and more advanced options 
> available on paid tiers. You can compare their plans here: 
> http://www.cloudflare.com/plans
>
> I would also recommend moving any large, static files to Google Cloud 
> Storage hosting. It's a bit easier to manage and separates your application 
> code from static assets.
>
>    
> -----------------
> -Vinny P
> Technology & Media Advisor
> Chicago, IL
>
> App Engine Code Samples: http://www.learntogoogleit.com
>  
>

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