C# Rest Sharp Post错误-基础连接已关闭：服务器已关闭预期保持活动状态的连接

我有一个MVCAPI（我们称之为API1），它向另一个较小的API（API2）发出请求。它使用Rest-Sharp来实现这一点

我的问题是，API 1第一次调用API 2时，它工作得非常好

但是，如果对API 2进行了另一次调用，那么它将无法报告

“基础连接已关闭：服务器已关闭预期保持活动状态的连接”

如果我回收了website/API 2的应用程序池，那么它又可以正常工作了

我试过其他帖子的一些建议

    ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12;
    ServicePointManager.Expect100Continue = false;
    ServicePointManager.DefaultConnectionLimit = 100;
    ServicePointManager.MaxServicePointIdleTime = 600000;

这些都没有帮助

我的代码如下

API 1使用以下代码：

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12;
        ServicePointManager.Expect100Continue = false;
        ServicePointManager.DefaultConnectionLimit = 100;
        ServicePointManager.MaxServicePointIdleTime = 600000;

        var client = new RestClient(baseApiUrl + "py/apte?employeeReference=" + employeeReference + "&paymentReference=" + paymentReference + "&hours=" + hours + "&rate=" + rate);
        client.Timeout = -1;
        var request = new RestRequest(Method.POST);
        request.AddHeader("Content-Type", "application/json");
        request.Timeout = 600000;

        var response = client.Execute<APIResponse>(request);
        APIResponse apiResponse = apiResponse = response.Data;

        return apiResponse;

ServicePointManager.SecurityProtocol=SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12；
ServicePointManager.Expect100Continue=false；
ServicePointManager.DefaultConnectionLimit=100；
ServicePointManager.MaxServicePointIdleTime=600000；
var client=new RestClient（baseApiUrl+“py/apte？employeeReference=“+employeeReference+”&paymentReference=“+paymentReference+”&hours=“+hours+”&rate=“+rate”）；
client.Timeout=-1；
var请求=新的重新请求（Method.POST）；
AddHeader（“内容类型”、“应用程序/json”）；
请求超时=600000；
var response=client.Execute（请求）；
APIResponse=APIResponse=response.Data；
返回响应；