JAVASCRIPT

react router catch all 404

<Switch>
   <Route path="/" exact component={Home}/>
   <Route path="/about" component={About}/>
   <Route component={Page404} />
</Switch>

react router 404

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteBase /
  RewriteRule ^index.html$ - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_FILENAME} !-l
  RewriteRule . /index.html [L]
</IfModule>