🔍 detect tcp proto by addr

app.go

@@ -479,15 +479,15 @@ func (app *App) Listen(address interface{}, tlsconfig ...*tls.Config) error {
 	}
 	// Update fiber server settings
 	app.init()
+	// Start prefork
+	if app.Settings.Prefork {
+		return app.prefork(addr, tlsconfig...)
+	}
 	// Set correct network protocol
 	network := "tcp4"
 	if isIPv6(addr) {
 		network = "tcp6"
 	}
-	// Start prefork
-	if app.Settings.Prefork {
-		return app.prefork(network, addr, tlsconfig...)
-	}
 	// Setup listener
 	ln, err := net.Listen(network, addr)
 	if err != nil {

prefork.go

@@ -29,12 +29,17 @@ func (app *App) IsChild() bool {
 }
 
 // prefork manages child processes to make use of the OS REUSEPORT or REUSEADDR feature
-func (app *App) prefork(network, addr string, tlsconfig ...*tls.Config) (err error) {
+func (app *App) prefork(addr string, tlsconfig ...*tls.Config) (err error) {
 	// 👶 child process 👶
 	if app.IsChild() {
 		// use 1 cpu core per child process
 		runtime.GOMAXPROCS(1)
 		var ln net.Listener
+		// Set correct network protocol
+		network := "tcp4"
+		if isIPv6(addr) {
+			network = "tcp6"
+		}
 		// Linux will use SO_REUSEPORT and Windows falls back to SO_REUSEADDR
 		// Only tcp4 or tcp6 is supported when preforking, both are not supported
 		if ln, err = reuseport.Listen(network, addr); err != nil {