Question

我有一个具有多个节点的集群/服务器，可以处理来自应用程序的请求。

用户正在运行的应用程序使用以下URL打开2个Web客户端：

为了支持粘性（我希望2个Web客户端中的每一个都能保持与节点的连接 - 持久性）， ConnectionLeaseTimeout保留默认值，表示“不关闭连接” 由于DefaultPersistentConnectionLimit默认为2，因此我将DefaultConnectionLimit设置为1。

问题：

servicePoint.CurrentConnections为2，尽管servicePoint.ConnectionLimit为1。
在服务器中，我看到远程主机端口正在发生变化，即我看到超过2个端口（每个客户端超过1个端口）。

我做错了什么？

我的班级输出：

CommunicationWebClient https://myprocess.myapp.com/api/json/v1

CommunicationWebClient https://myprocess.myapp.com/api/protobuf/v1

SendAsync _uri = https://myprocess.myapp.com/api/json/v1 servicePoint.Address = https://myprocess.myapp.com/api/json/v1 servicePoint.ConnectionLimit = 1 servicePoint.CurrentConnections = 2

...

SendAsync _uri = https://myprocess.myapp.com/api/protobuf/v1 servicePoint.Address = https://myprocess.myapp.com/api/json/v1 servicePoint.ConnectionLimit = 1 servicePoint.CurrentConnections = 2

...

public sealed class CommunicationWebClient : IDisposable
{
    private HttpClient _httpClient;
    private Uri _uri;

    public CommunicationWebClient(Uri uri)
    {
        Logger.Debug($"{nameof(CommunicationWebClient)} {nameof(uri)}={uri}");

        _uri = uri;

        ServicePointManager.DefaultConnectionLimit = 1;

        _httpClient = new HttpClient(new WebRequestHandler())
        {
            Timeout = 10.Minutes(),
        };
    }

    public void Dispose()
    {
        _httpClient.Dispose();
    }


    public async Task SendAsync(
        ByteArrayContent content)
    {
        var servicePoint = ServicePointManager.FindServicePoint(_uri);

        Logger.Debug($"{nameof(SendAsync)} " +
                    $"{nameof(_uri)}={_uri} " +
                    $"{nameof(servicePoint.Address)}={servicePoint.Address} " +
                    $"{nameof(servicePoint.ConnectionLimit)}={servicePoint.ConnectionLimit} " +
                    $"{nameof(servicePoint.CurrentConnections)}={servicePoint.CurrentConnections}");

        using (var httpResponseMessage = await _httpClient.PostAsync(_uri, content))
        {
            ...
        }
    }
}

Answer 1

如果仍有问题，请检查您的CommunicationWebClient是否过于频繁。它处理HttpClient但它的行为并不像通常人们期望的那样。

查看此文章：https://docs.microsoft.com/en-us/azure/architecture/antipatterns/improper-instantiation/

当你在Windows中处理HttpClient时，你会要求Windows关闭所有打开的套接字。但默认情况下，Windows有4分钟的超时时间来完全关闭套接字。因此，对于所有这4分钟，您的HttpClient和Web服务器之间将存在连接。

CurrentConnections超过ServicePoint中的ConnectionLimit

1 个答案: