高并发下，每隔断时间就会提示这样的错误：http2: client connection force closed via ClientConn.Close
下面是核心代码：
```
defaultTransport := http.DefaultTransport
tr := *defaultTransport.(*http.Transport)
tr.TLSClientConfig = &tls.Config{
InsecureSkipVerify: true,
}
tr.MaxConnsPerHost = 30000
tr.MaxIdleConnsPerHost = 10000
client = &http.Client{
Transport: &tr,
Timeout: time.Duration(5) * time.Second,
}
```
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