default http client in golang

httpc.go

transport := &http.Transport{
    Proxy: http.ProxyFromEnvironment,
    DialContext: (&net.Dialer{
        Timeout: 5 * time.Second,
        KeepAlive: 30 * time.Second,
    }).DialContext,
    TLSHandshakeTimeout: 5 * time.Second,
    ExpectContinueTimeout: 5 * time.Second,
    ResponseHeaderTimeout: 7 * time.Second,
    IdleConnTimeout: 5 * time.Second,
    MaxIdleConns: 10,
    MaxIdleConnsPerHost: 2,
    ForceAttemptHTTP2: true,
}
http2.ConfigureTransport(transport)
httpc := &http.Client{Transport: transport}
defer httpc.CloseIdleConnections()