You shouldn't use a security model based on ensuring that requests
come from the app engine IP block even if it were possible; literally
anyone could be running malicious code on appspot making this at best
marginally more secure than allowing requests from any IP. There are
countless techniques for doing real authentication.

On Mar 1, 11:15 pm, Iap <[email protected]> wrote:
> Hi,
>
> I have a back-end web service which I would only allow the requests
> from my GAE application.
> So I want to check the IP if it comes from the GAE urlfetch. (plus
> some secret token)
> From my testing, there is only one IP: "64.233.172.18" was found.
> I am curious about if there are other IPs that might be used by the urlfetch?
> Because that "only one" IP seems to be weird for the so-called "cloud
> architecture".
> Just for confirmation.
>
> My Test URL is:http://password-recovery.appspot.com/prs/test/urlfetchrequest
> (That will fetching thehttp://remote.12dt.com/which responses the
> requsting ip)
>
> Thanks in advance.

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