Right now it's only being sent when the request is to an appspot.com
url. Is that the case in your example?

On Fri, Jul 29, 2011 at 9:40 AM, MiuMeet Support <[email protected]> wrote:
> Why isn't this header present if I call my own app from my app?
> I'm trying to build an appengine lib that will interact with an appengine
> app,
> but if that appengine app uses the lib too, the headers will be missing...
> :(
> Cheers :)
> -Andrin
>
> On Tue, Jul 26, 2011 at 5:24 PM, Jon McAlister <[email protected]> wrote:
>>
>> I should also point out that, while this header is not yet documented,
>> it's not going away either, and will be documented in an upcoming
>> release.
>>
>> On Tue, Jul 26, 2011 at 8:23 AM, Jon McAlister <[email protected]> wrote:
>> > 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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>> >
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