You can optionally issue a new refresh token in the response, or if you don’t include a new refresh token, the client assumes the current refresh token will continue to be valid. The response to the refresh token grant is the same as when issuing an access token. The following is an example refresh grant the service would receive. The server may issue a new refresh token in the response, but if the response does not include a new refresh token, the client assumes the existing refresh token will still be valid. If everything checks out, the service can generate an access token and respond. If the refresh token was issued to a confidential client, the service must ensure the refresh token in the request was issued to the authenticated client. The server then checks whether the refresh token is valid, and has not expired. Verifying the refresh token grantĪfter checking for all required parameters, and authenticating the client if the client was issued a secret, the authorization server can continue verifying the other parts of the request. If the client does not have a secret, then no client authentication will be present in this request. Typically the service will allow either additional request parameters client_id and client_secret, or accept the client ID and secret in the HTTP Basic auth header. If the client was issued a secret, then the client must authenticate this request. However, since it is possible to use the authorization code flow without a client secret, the refresh grant may also be used by clients that don’t have a secret. Typically, refresh tokens are only used with confidential clients. JWT Header (Base64 encoded json string and it contains information about the signature algorithm used in the JWT token and type of JWT token) 2. Below is the structure of a JWT Token, 1. Client Authentication (required if the client was issued a secret) JWT Token has three parts, separated by dot, and is encoded in Base64. Typically this will not be included in the request, and if omitted, the service should issue an access token with the same scope as was previously issued. The requested scope must not include additional scopes that were not issued in the original access token. The refresh token previously issued to the client. The grant_type parameter must be set to “refresh_token”. The access token request will contain the following parameters. If your service issues refresh tokens along with the access token, then you’ll need to implement the Refresh grant type described here. This section describes how to allow your developers to use refresh tokens to obtain new access tokens. Short-lived tokens with Long-lived authorizations.User Experience and Alternative Token Issuance Options.OAuth for Browserless and Input-Constrained Devices.Checklist for Server Support for Native Apps.Deleting Applications and Revoking Secrets.
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