Why does the ID of Google's OpenID implementation change?

Posted by Andrea on Stack Overflow See other posts from Stack Overflow or by Andrea
Published on 2010-04-21T16:10:40Z Indexed on 2010/04/21 16:33 UTC
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I'm trying to implement OpenId login for a web application. Whenever new user who logs in via OpenId I create a new user on the sustem, and among the data I store their openid URL, so that next time they login with that user.

I'm testing this with my Gmail OpenID, and the problem is that everytime I do this, Google sends a different openid URL, that is, https://www.google.com/accounts/o8/id?id=SomethingThatChangesFromTimeToTime

Of course I'm then not able to tell wheter this is or not a new user. I'm a bit puzzled: shouldn't the openid identifier always remain the same?

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