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Once you've enabled OpenID authentication for your app, a few things change: URLs generated by create_login_url without a federated_identity parameter specified will redirect to the OpenID login page for Google Accounts. URLs that are protected by "login: required" in app.yaml or web.xml will result in a redirect to the path "/_ah/login_required", with a "continue" parameter of the page originally fetched. This allows you to provide your own openid login page. URLs generated by create_login_url with a federated_identity provider will redirect to the specified provider.

many users, when asked for their "openid URL" will simply look at you in puzzlement. What we need is a solution that avoids the need for most users to enter their URL themselves, while still allowing savvy users to do just that. Fortunately, there are a number of such solutions. One of them is clickpass. After signing in there and setting up an entry for your site, they'll provide you with code for a button that you can embed in your login page, and which allows users to choose from a number of well-known identity providers, including Hotmail, Yahoo!, Google, and Facebook, as well as entering their own URL.