How to set up react-route in conjunction with express?

Question

Express.js

I use React-Route and expess.
It is necessary to give the file public/index.html in all ways.
On the server, the code is as follows:

//устанавливаем папку public за статику.
app.use(express.static('public'));
//путь "/"
app.get('/', (req, res) => {
    res.sendFile( __dirname + '/public/index.html' );
});
//путь "/signin"
app.get('/signin', (req, res) => {
    res.sendFile( __dirname + '/public/index.html' );
});

React-Router on the client:

<Router history={browserHistory}>
        <Route path="/" component={Home} />
        <Route path="/signin" component={LoginForm} />
</Router>

When the server starts, the {Home} component is displayed perfectly,
but getting into the "/signin" path, the {loginForm} component can only be accessed through a link
<Link to="/signin"> signin </Link>
that is in the Home component.
The problem is that if we hit the /signin path and reload the page with F5, we get the following error:
Error: ENOENT: no such file or directory, stat 'C:\Web development\server\public\index.html'
at Error (native )
Express requires statics, but I already added a public folder on the server. How to solve the problem?