add Launcher.StartURL option

lib/launcher/launcher.go

@@ -42,6 +42,7 @@ type Launcher struct {
 // Headless will be enabled by default.
 // Leakless will be enabled by default.
 // UserDataDir will use OS tmp dir by default.
+// StartURL will be set to GetSelfClosePage().
 func New() *Launcher {
 	dir := defaults.Dir
 	if dir == "" {
@@ -58,7 +59,7 @@ func New() *Launcher {
 		"headless": nil,
 
 		// to prevent welcome page
-		"": {getSelfClosePage()},
+		"": {GetSelfClosePage()},
 
 		"disable-background-networking":                      nil,
 		"disable-background-timer-throttling":                nil,
@@ -120,7 +121,7 @@ func NewUserMode() *Launcher {
 		ctxCancel: cancel,
 		Flags: map[string][]string{
 			"remote-debugging-port": {"37712"},
-			"":                      {getSelfClosePage()},
+			"":                      {GetSelfClosePage()},
 		},
 		exit:    make(chan struct{}),
 		browser: NewBrowser(),
@@ -259,6 +260,11 @@ func (l *Launcher) Env(env ...string) *Launcher {
 	return l.Set(flagEnv, env...)
 }
 
+// StartURL to launch
+func (l *Launcher) StartURL(u string) *Launcher {
+	return l.Set("", u)
+}
+
 // FormatArgs returns the formated arg list for cli
 func (l *Launcher) FormatArgs() []string {
 	execArgs := []string{}

lib/launcher/launcher_test.go

@@ -103,6 +103,8 @@ func (t T) Launch() {
 }
 
 func (t T) LaunchUserMode() {
+	_ = os.Remove(launcher.GetSelfClosePage())
+
 	l := launcher.NewUserMode()
 	defer l.Kill()
 
@@ -122,6 +124,7 @@ func (t T) LaunchUserMode() {
 		Leakless(false).Leakless(true).
 		Headless(false).Headless(true).RemoteDebuggingPort(port).
 		Devtools(true).Devtools(false).
+		StartURL("about:blank").
 		Proxy("test.com").
 		UserDataDir("test").UserDataDir(dir).
 		WorkingDir("").

lib/launcher/utils.go

@@ -113,7 +113,8 @@ func unzip(logger io.Writer, from, to string) (err error) {
 	return zr.Close()
 }
 
-func getSelfClosePage() string {
+// GetSelfClosePage returns an absolute file path of page that will close it self after it's opened.
+func GetSelfClosePage() string {
 	path := filepath.Join(os.TempDir(), "rod", "self-close.html")
 
 	if !utils.FileExists(path) {