Hey Jerry,
It appears the app
sfghfghfdg is spoofing the
google.com search page. This could indeed be part of a phishing attempt by the creator of the app. We've taken note of this and will review the app.
However, as for the "insecure page", this is a result of the fact that the
appspot.com domain does not serve a certificate which covers *.*.
appspot.com, which is the format of the domain
plus.sfghfghfdg.appspot.com. The page you see is a standard page served by your browser to warn the user of this fact.
Cheers,
Nick
Cloud Platform Community Support