当客户端在IdentityServer3中请求新的引用令牌时，如何撤销旧的引用令牌？

app.UseIdentityServerBearerTokenAuthentication(new IdentityServerBearerTokenAuthenticationOptions
{
    Authority = "https://your-identity-server-url",
    RequiredScopes = new[] { "api" },
    EnableValidationResultCache = true,
    ValidationResultCacheDuration = TimeSpan.FromMinutes(10),
    TokenProvider = new TokenProvider
    {
        OnRevoke = async token =>
        {
            // 撤销旧的引用令牌的逻辑
        }
    }
});

public class TokenProvider
{
    public Func<Token, Task> OnRevoke { get; set; }

    public async Task RevokeToken(Token token)
    {
        await OnRevoke?.Invoke(token);
    }
}

public async Task RevokeToken(string token)
{
    using (var client = new HttpClient())
    {
        var revokeEndpoint = "https://your-identity-server-url/revoke";
        var content = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("token", token)
        });

        var response = await client.PostAsync(revokeEndpoint, content);
        if (response.IsSuccessStatusCode)
        {
            // 令牌撤销成功
        }
        else
        {
            // 令牌撤销失败
        }
    }
}