调试出了一个诡异的问题,使用多个进程没问题,单进程出现了。

fix:

//默认限制为2个连接
//public const int DefaultPersistentConnectionLimit = 2;
ServicePointManager.DefaultConnectionLimit = int.MaxValue; // Summary:
// The default number of non-persistent connections (4) allowed on a System.Net.ServicePoint
// object connected to an HTTP/1.0 or later server. This field is constant but
// is no longer used in the .NET Framework 2.0.
public const int DefaultNonPersistentConnectionLimit = ;
//
// Summary:
// The default number of persistent connections (2) allowed on a System.Net.ServicePoint
// object connected to an HTTP/1.1 or later server. This field is constant and
// is used to initialize the System.Net.ServicePointManager.DefaultConnectionLimit
// property if the value of the System.Net.ServicePointManager.DefaultConnectionLimit
// property has not been set either directly or through configuration.
public const int DefaultPersistentConnectionLimit = ;

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