How do I know a site running on the GAE

How can we know that a website is running on GAE?

If a Web site running on GAE, then one of the following three things will be true:

1)Site alias record (CNAME) points to ghs.google.com, ghs.l.google.com or appspot.l.google.com.

2)Visit the site with path /form will return a Google-style 404 error page.

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