OSS.dll 导入untiy后调用使用.net3.5时出现空引用，切换到.net4x后可以，C#工程单独运行没问题
NullReferenceException: Object reference not set to an instance of an object
Aliyun.OSS.Common.Communication.HttpExtensions.AddInternal (System.Net.WebHeaderCollection headers, System.String key, System.String value)
Aliyun.OSS.Common.Communication.HttpFactory.SetRequestHeaders (System.Net.HttpWebRequest webRequest, Aliyun.OSS.Common.Communication.ServiceRequest serviceRequest, Aliyun.OSS.Common.ClientConfiguration configuration)
Aliyun.OSS.Common.Communication.HttpFactory.CreateWebRequest (Aliyun.OSS.Common.Communication.ServiceRequest serviceRequest, Aliyun.OSS.Common.ClientConfiguration configuration)
Aliyun.OSS.Common.Communication.ServiceClientImpl.SendCore (Aliyun.OSS.Common.Communication.ServiceRequest serviceRequest, Aliyun.OSS.Common.Communication.ExecutionContext context)
Aliyun.OSS.Common.Communication.ServiceClient.Send (Aliyun.OSS.Common.Communication.ServiceRequest request, Aliyun.OSS.Common.Communication.ExecutionContext context)
Aliyun.OSS.Common.Communication.RetryableServiceClient.SendImpl (Aliyun.OSS.Common.Communication.ServiceRequest request, Aliyun.OSS.Common.Communication.ExecutionContext context, Int32 retryTimes)
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