Can't change user-agent on headless mode

[qphuongl]

Hi, I tried to change UserAgent while running headless mode to avoid HeadlessChrome, but it was not working; here is my config:

• BrowserTypeLaunchOptions:

Args: ["--disable-extensions","--disable-images","--window-size=1920,1080","--start-maximized", "--headless=new"]
HandleSIGUP, HandleSIGINT, HandleSIGTERM: false
IgnoreDefaultArgs: ["--enable-automation","--no-sandbox","--mute-audio","--headless","--disable-features"]

I ignored the default --headless flag because I want to use --headless=new to access chrome://version after trying --headless (failed).

• BrowserNewContextOptions

UserAgent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36"

Actually, I tried to change userAgent in both headless and head mode but it's still not working. But right now, I'm dealing with headless mode.

Spec:

• Chromium 123.0.6312.4 (Developer Build) (arm64)
• Javascript: V8 12.3.219.1
• OS: macOS version 14.4

[canstand]

Can't reproduce it. It worked fine in my test.

func TestHeadlessNew(t *testing.T) {
	b2, err := browserType.Launch(playwright.BrowserTypeLaunchOptions{
		Headless: playwright.Bool(false),
		Args: []string{
			"--disable-extensions", "--disable-images", "--window-size=1920,1080", "--start-maximized", "--headless=new",
		},
		IgnoreDefaultArgs: []string{"--enable-automation", "--no-sandbox", "--mute-audio", "--headless", "--disable-features"},
	})
	require.NoError(t, err)
	defer b2.Close()
	nCtx, err := b2.NewContext(playwright.BrowserNewContextOptions{
		UserAgent: playwright.String("foobar/1.0"),
	})
	require.NoError(t, err)
	defer nCtx.Close()
	nPage, err := nCtx.NewPage()
	require.NoError(t, err)

	resChan := server.WaitForRequestChan("/empty.html")
	_, err = nPage.Goto(server.PREFIX + "/empty.html")
	require.NoError(t, err)
	res := <-resChan
	require.True(t, strings.HasPrefix(res.Header.Get("User-Agent"), "foobar"))
}