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+# Single Sign-On with OpenID Connect
+
+Welcome to this demonstration of how to implement *OpenID Connect* (OIDC) authentication in a SQLPage application.
+
+[OIDC](https://openid.net/connect/) is a standard authentication protocol that allows users to authenticate with a third-party identity provider and then access applications without having to log in again. This is useful for single sign-on (SSO) scenarios where users need to access multiple applications with a single set of credentials. OIDC can be used to implement a "Login with Google" or "Login with Facebook" button in your application, since these providers support the OIDC protocol.
+
+To test this application, click the login button on the top right corner of the page.
+You will be redirected to the identity provider's login page, where you can login with the following credentials:
+- **Username: `demo`**
+- **Password: `demo`**
+
+After logging in, you will be redirected back to this page, and you will see the user information that was returned by the identity provider.
+
+This example also contains a CAS (Central Authentication Service) client that demonstrates how to authenticate users using the CAS protocol (version 3.0), which is mostly used in academic institutions. [Log in with CAS](/cas/login.sql)
+
+![closed](/assets/closed.jpeg)