Authorization code request oauth2

Description > Authorization code request oauth2

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A common way to implement these tokens is to create a database record for each token granted, indexed by a cryptographically secure number, generated with 128 bits 16 bytes of entropy, and to use the base64-encoded index number as the refresh token. This also works because when we redirect the user, we're asking for the profile scope. The app can base64Url decode the segments of this token to request information about the user who signed in.

So there can be certificate related issues. It's not an access token, which is really want we want, but it's the key to getting that. As the client application, which is typically JavaScript running within a Browser is less trusted, no refresh tokens for long-lived access are returned. Request a new token from the authorization server.

OAuth 2.0 Authorization Code Requests and Responses - The refresh token is a long-living token that does not expire, unless it is explicitly revoked by the resource owner.