Connection pooling in Go

Go manages connection pooling automatically via the http.Transport type, which caches idle connections for reuse. To configure pool behavior, instantiate a Transport with specific limits like MaxIdleConns and MaxIdleConnsPerHost, then assign it to your http.Client.

client := &http.Client{
	Transport: &http.Transport{
		MaxIdleConns:        100,
		MaxIdleConnsPerHost: 2,
		IdleConnTimeout:     90 * time.Second,
	},
}

If you need to disable connection reuse entirely, set DisableKeepAlives to true in the Transport configuration.

Connection pooling is like a library of reusable phone lines that your program keeps open instead of dialing a new number for every call. It saves time and resources by reusing existing connections to the same server. You configure it by setting limits on how many lines to keep open and how long to wait before closing them.