Yes, you can assume this.

The only cases where this header will be allowed through to the app are:
    (a) another app is requesting your app using our urlfetch api [or,
the app is urlfetching itself]
    (b) the request came from a logged-in admin of your app

While (a) is the primary intention of this header, (b) can be useful
for debugging purposes.

On Tue, Jul 26, 2011 at 2:39 AM, Andrin von Rechenberg
<[email protected]> wrote:
> Hey there
> I was wondering if the header HTTP_X_APPENGINE_INBOUND_APPID
> could be faked by a client or if the Google Frontends authenticate this
> header
> somehow?
> Is it secure to assume that if HTTP_X_APPENGINE_INBOUND_APPID is present,
> the request is really from that app?
> Cheers,
> -Andrin
>
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