how to change favicon

Hi,
I have searched for my problem in the Dash community forum.
but it seems no any change when i try to change the favicon.

app.head = [
    html.Link(
        href='https://www.google.com/favicon.ico',
        rel='icon'
    ),
]

After starting to run, the page source code is

<link rel="icon" type="image/x-icon" href="/_favicon.ico">

I add this code according to the tutorial on this page:#171

anyone here have the same problem?

I haved solved this problem by #406

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