On Wed, Feb 11, 2015 at 9:27 AM, camaram <[email protected]> wrote:

> To add something more on this. 'googleusercontent.com' domain is used for
> any customer originated traffic from within the Google Infrastructure. This
> includes both Google App Engine and Google Compute Engine.
>


Emphasizing the above. Googleusercontent is not just Google cloud platform
services, but also Apps Scripts (a GApps service)
<https://developers.google.com/apps-script/reference/url-fetch/> and also
(at least it used to) originates traffic from Google docs (for instance, if
you embed another site's pictures within a document
<https://news.ycombinator.com/item?id=7371176>).

You'll want to look closely at the User-Agent header in addition to
X-Appengine-Inbound-Appid header.


-----------------
-Vinny P
Technology & Media Consultant
Chicago, IL

App Engine Code Samples: http://www.learntogoogleit.com

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