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One of the changes in OAuth 2.1 addresses attacks with refresh token replays by recommending the use of one-time use tokens. A refresh token is thus rotated and invalid after exactly one use, returning a new token for each successful grant. Any further attempts must thus use the most recently acquired refresh token. Reusing a refresh token may also cause the authorization server to invalidate the current active refresh token, requiring a refresh authorization grant to be reacquired for further refresh token usage. The use of locks prevents multiple refresh grant attempts for a given session from happening across concurrent requests.