This is fairly well-known, I think; for example, there's a mention of this here (search for appspot.com):
http://lcamtuf.blogspot.com/2010/10/http-cookies-or-how-not-to-design.html I think it's also covered in "The Tangled Web"; it's also why you see domains such as blogspot.com and appspot.com in PSL: http://mxr.mozilla.org/mozilla-central/source/netwerk/dns/effective_tld_names.dat?raw=1 /mz
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