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* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
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this(null, isMetricEnabled, null);
credentialsThe optional credentials used to sign the associated request.
Note that this will be checked BEFORE the HTTP client consults the user-specified RetryPolicy. i.e. if the configured AuthErrorRetryStrategy says the request should be retried, the retry will be performed internally and the effect is transparent to the user's RetryPolicy.