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

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,
}