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I was testing out something and ran into this issue yesterday as well. I created a cname to point to http://ip.jsontest.com/ http://ip.jsontest.com/ so I could

I was testing out something and ran into this issue yesterday as well. I created a cname to point to http://ip.jsontest.com/ http://ip.jsontest.com/ so I could validate my DNS was working. For some reason I was getting the google 404 page.

danpalmer 3y ago
That would be because that site is hosted on a Google service, but depends on the hostname to figure out which customer/backend to use. This is normal for any multi-tenant hosting. Your CNAME is not registered for that application in the hosting service's database and therefore they can't tell what it's for. Remember that a CNAME isn't a redirect or anything, there's literally no way for the receiving webserver to know the domain that was CNAME'd in these sorts of requests.