require ‘rack’ require ‘rack/contrib/try_static’

use Rack::TryStatic,

root: "public",  # static files root dir
urls: %w[/],     # match all requests
try: ['.html', 'index.html', '/index.html'] # try these postfixes sequentially

# otherwise 404 NotFound run -> { [404, {‘Content-Type’ => ‘text/html’}, [‘whoops! Not Found’]]}