It's called OpenID delegation , it allows you to use your domain, redirecting any openid requests to an openid selection request.
Here is a guide with a sample code.
Using openId delegation
Example from the manual:
<link rel="openid.server"
href="https://www.myopenid.com/server">
<link rel="openid.delegate"
href="http://windley.myopenid.com">
Edit: Unfortunately, I cannot use my google openid because they do not provide uri for the server :(
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