Google is shutting down Open ID 2.0 and migrating Open ID 2.0 to the Google Plus Sign-In. Open ID 2.0 and Google Plus Sign-In is a way that allows website owners to let their users log into their website using their Google account credentials.
Shutting down Open ID 2.0 and migrating to Google Plus Sign-In is further proof that Google Plus is really here to stay.
According to Google, there is no Developer Registration for Open ID 2.0, so there is no way for Google to contact web developers using Open ID 2.0. However, I believe that there would most likely be a way for Google to identify the sites using Open ID 2.0. For example, they could actually identify the sites using it–and then contact the site owners using Google Webmaster Tools.
Here is the schedule for the migration to Google Plus Sign-In:
January 12, 2015: Auto-approval is progressivly disabled for more and more users, these users will be forced to re-consent. Developers passing openid_shutdown_ack are unaffected.
February 23, 2015: Auto-approval is turned off, users must consent on each request. Developers passing openid_shutdown_ack are unaffected.
March 23, 2015: Grace period for developers using the openid_shutdown_ack parameter ends, warning is shown and auto-approval turned off for all applications.
April 20, 2015: OpenID is shut down. A static error page will be displayed on all requests. Make sure you have migrated well before this date.
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