express.static() cannot get favicon and files without index.html in build folder

express can’t find static files in build folder. express can serve files in static folder now. but only problem that file path likes <link rel="icon" href="/favicon.ico"/> in index.html it reach res.send('ERROR')

however, when I change favicon and manifest path like <link rel="icon" href="/assets/favicon.ico"/>. it serve file I expected.

    server  
    --build  
    ----static  
    ----assets  
    ------favicon.ico
    ------manifest.json
    ----index.html  
    ----favicon.ico  
    ----manifest.json  
    --server.js

    localhost => return index.html good  
    localhost/index.html, favicon.ico, else... => return ERROR  
    localhost/assets/favicon.ico, manifest.json => return files good  

    app.use('/static', express.static(path.join(__dirname, 'build/static')));
    app.use(express.static(path.join(__dirname, 'build')));
    app.use('/*', (req, res) => res.send('ERROR');