Sample negroni and newrelic go-agent integration

main.go

package main

import (
	"fmt"
	"net/http"
	"github.com/newrelic/go-agent"
	"github.com/urfave/negroni"
)

func main() {
	config := newrelic.NewConfig("Your Application Name", "__YOUR_NEW_RELIC_LICENSE_KEY__")
	app, err := newrelic.NewApplication(config)

	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		fmt.Fprintf(w, "Welcome to the home page!")
	})

	n := negroni.Classic() // Includes some default middlewares
	n.Use(negroni.HandlerFunc(func(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
		tx := app.StartTransaction(fmt.Sprint("%s - %s", r.Method, r.URL.Path), rw, r)
		defer tx.End()
		next(rw, r)
	}))
	n.UseHandler(mux)

	http.ListenAndServe(":3000", n)
}

Newrelic is warning users of this method about the explosion of the transaction names. For me, I verify if the response is OK (200) to end the transaction, otherwise I abort it to not log it. Just an info.