Google app engine DNS issues: Server not found

I've got an app that I want to run on my www subdomain. It's been running on a tes开发者_Go百科t subdomain - gae - for a while, and is still running there. In my google apps account, I added the www subdomain for the app angine application, and have added the appropriate CNAME to my DNS. For some reason, while I can still see the app on my gae subdomain, I get the browser's "Can't find the server" error message when trying to connect to the www subdomain. Any great ideas why?

What's even weirder, is that I can't view the app on its appspot URL: saturdayplace-static-sites.appspot.com

gae.saturdayplace.com - works

www.saturdayplace.com - can't even get a 404 here. The server is MIA, same as the appspot URL above. What's going on?

Your app is serving 404 responses on both of those domains. As to why it's doing that, it's impossible to say without seeing your code - perhaps you have some middleware that discriminates based on domain?

The problem ended up being a DNS issue, which I think I've gotten straightened out.