How to Reuse HTTP Connections in Go (Connection Pooling)

Reuse HTTP connections in Go by sharing a single http.Client instance across all requests, as the default Transport automatically manages connection pooling. Avoid creating new clients per request or setting Transport.MaxIdleConns to 0, which disables reuse. If you must disable reuse due to specific legacy issues, set Transport.DisableKeepAlives to true.

var client = &http.Client{
	Transport: &http.Transport{
		MaxIdleConns:        100,
		MaxIdleConnsPerHost: 10,
	},
}

resp, err := client.Get("https://example.com")
if err != nil {
	// handle error
}
defer resp.Body.Close()

Connection pooling keeps network connections open so your program doesn't waste time reconnecting for every single request. Think of it like keeping a phone line open for a conference call instead of dialing a new number for every person you speak to. By reusing one client, Go automatically handles this efficiency for you.