To use openid.ax.required to request authentication. Because this option is required by Google, But this is not required by Yahoo.
It never needs to use Ax to Google This is not required, neither Yahoo, or any other provider.
AX is an extension that allows you to get additional data, such as a user's name or email. openid.ax Required contains fields that you want to fetch and mark as required fields.
For more information, read the specification.
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