Golang http.DefaultClient 连接服务端压测时出现大量TIME_WAIT异常

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今天在做一个压测场景时，通过golang作为client去连接服务，在client的服务器上出现大量的TIME_WAIT连接。经过查找资料，得到解决，参考如下：

The default http.Transport is opening and closing connections too quickly. Since all connections are to the same host:port combination, you need to increase MaxIdleConnsPerHost to match your value for num_coroutines. Otherwise, the transport will frequently close the extra connections, only to have them reopened immediately.

You can set this globally on the default transport:

http.DefaultTransport.(*http.Transport).MaxIdleConnsPerHost = numCoroutines

Or when creating your own transport

t := &http.Transport{
    Proxy: http.ProxyFromEnvironment,
    DialContext: (&net.Dialer{
        Timeout:   30 * time.Second,
        KeepAlive: 30 * time.Second,
    }).DialContext,
    MaxIdleConnsPerHost:   numCoroutines,
    MaxIdleConns:          100,
    IdleConnTimeout:       90 * time.Second,
    TLSHandshakeTimeout:   10 * time.Second,
    ExpectContinueTimeout: 1 * time.Second,
}

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