为重复使用的HttpClient对象动态修改Timeout

services.AddHttpClient<MyApiService>((sp, client) =>
{
    client.Timeout = System.Threading.Timeout.InfiniteTimeSpan;
    client.BaseAddress = sp.GetService<MyOptions>().ApiEndpoint;
    }
});

CancellationTokenSource cts;
bool disposeCts;
bool hasTimeout = _timeout != s_infiniteTimeout;
if (hasTimeout || cancellationToken.CanBeCanceled)
{
    disposeCts = true;
    cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _pendingRequestsCts.Token);
    if (hasTimeout)
    {
        cts.CancelAfter(_timeout);
    }
}
else
{
    disposeCts = false;
    cts = _pendingRequestsCts;
}