Google OpenID: the page you requested is invalid

Question

I\'m writing a Relying Party, and use the Google provider. Yadis leads me to https://www.google.com/accounts/o8/ud, I create an association, and redirect the user\'s browser

Answer 1

The error was literally triggered by not including the openid.claimed_id and openid.identity parameters, which must be set to "http://specs.openid.net/auth/2.0/identifier_select". With these set, I get another error, which can be resolved by also filling out openid.realm, with the same value as openid.return_to.

Even though I also implemented RP discovery, Google does not appear to use it.