.htaccess

<ifModule mod_rewrite.c>
  RewriteEngine On

  # Redirection to HTTPS:
  RewriteCond %{HTTPS} !on
  RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

  # RewriteBase /sites
  # RewriteCond %{HTTP:Accept} text/html
  # RewriteCond %{REQUEST_FILENAME} !-f
  # RewriteCond %{REQUEST_FILENAME} !-d
  # RewriteRule ^sites/([a-z0-9_-]+)/.*$ "/sites/$1/index.html" [QSA,L]

  RewriteCond %{HTTP:Accept} text/html
  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -s [OR]
  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -f [OR]
  RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} -d
  RewriteRule ^sites/([a-z0-9_-]+)/.*$ - [NC,L]
  # Redirect all non-file routes to index.html
  RewriteRule ^sites/([a-z0-9_-]+)/.*$ sites/$1/index.html [NC,L]
</ifModule>

#Gzip
<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css application/x-javascript application/javascript text/javascript
</ifmodule>
#End Gzip