RetryMethod.swift

func retry(_ request: Request, for session: Session, dueTo error: Error,
              completion: @escaping (RetryResult) -> Void) {
    guard request.retryCount < retryLimit else {
        completion(.doNotRetry)
        return
    }
    print("\nretried; retry count: \(request.retryCount)\n")
    refreshToken { isSuccess in
        isSuccess ? completion(.retry) : completion(.doNotRetry)
    }
}