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What is the mechanism of the `ghs.google.com` domain?

Asked 2011-02-13T14:36:59.150
19

If I want to bind a domain name to my app on the GAE (Google App Engine), I should add a CNAME record to ghs.google.com. I'd like to understand how this domain works.

For example, I have a CNAME like this: blog.goace.com → ghs.google.com, and my app's URL is ace.appspot.com. When I type http://blog.goace.com in my browser, what will happen before I see my Gapp on the screen?

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29

Your browser sends a request to Google's server with the Host: yoursite.com header.

Google looks up this hostname in a (very large) database mapping hostnames to websites, then serves the corresponding website.

This database includes App Engine apps, Google Apps aliases, BlogSpot blogs, and other things.

answered 2011-02-13T14:42:16.377

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