.htaccess

RewriteEngine On
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
RewriteRule ^ - [L]

RewriteRule ^ /index.html [L]

# Prevent caching of service worker file
<FilesMatch "sw\.js$">
  <IfModule mod_headers.c>
    Header set Cache-Control "no-store, no-cache, must-revalidate, max-age=0"
    Header set Pragma "no-cache"
    Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
  </IfModule>
</FilesMatch>

# Cache index.html with short expiration to allow updates
<FilesMatch "index\.html$">
  <IfModule mod_headers.c>
    Header set Cache-Control "public, max-age=300, must-revalidate"
  </IfModule>
</FilesMatch>