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OpenID was previously the main login flow for Stack Exchange; it has since been deprecated, and the endpoints and URL were removed on November 1, 2022.

OpenID is an open standard that allows users to log in to many websites with a single set of third-party credentials.

Stack Exchange used to use OpenID as its main mechanism to allow users to log in on Stack Exchange sites. OpenID has since been deprecated and is in the process of removal.

Since November 1, 2022, OpenID endpoints and URL were removed.