Serving both HTTP and HTTPS (TLS) requests in Go

go-tls-server.go

package main

import (
	"fmt"
	"net/http"
	"sync"
)

func homeRouteHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello, you've requested: %s\n", r.URL.Path)
}

func main() {
	var wg sync.WaitGroup
	mux := http.NewServeMux()
	mux.HandleFunc("/", homeRouteHandler)

	// HTTP Listener (without TLS)
	httpPort := ":8083"
	wg.Add(1)
	go func() {
		fmt.Printf("go-tls-server listening to HTTP requests on PORT %s \n", httpPort)
		defer wg.Done()
		if err := http.ListenAndServe(httpPort, mux); err != nil {
			fmt.Println("HTTP server error:", err)
		}
	}()

	// HTTPS Listener (with TLS)
	httpsPort := ":8082"
	cert := "localhost.crt"
	privateKey := "localhost.key"
	wg.Add(1)
	go func() {
		fmt.Printf("go-tls-server listening to HTTPS requests on PORT %s \n", httpsPort)
		defer wg.Done()
		if err := http.ListenAndServeTLS(httpsPort, cert, privateKey, mux); err != nil {
			fmt.Println("HTTPS server error:", err)
		}
	}()

	wg.Wait()
}