Golang http.DefaultClient 串連服務端壓測時出現大量TIME_WAIT異常

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

今天在做一個壓測情境時，通過golang作為client去串連服務，在client的伺服器上出現大量的TIME_WAIT串連。經過尋找資料，得到解決，參考如下：

 

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,}