.htaccess

# turn off directory browsing
IndexIgnore *
Options All -Indexes

<files "short_urls.json">
  Order Allow,Deny
  Deny from all
</files>

<ifmodule mod_rewrite.c>
  Options +FollowSymLinks
  RewriteEngine On
  # RewriteBase /

  ErrorDocument 400 /index.php?e=400
  ErrorDocument 401 /index.php?e=401
  ErrorDocument 403 /index.php?e=403
  ErrorDocument 404 /index.php?e=404
  ErrorDocument 500 /index.php?e=500

  RewriteRule ^sitemap\.xml$ index.php?* [L,PT]
  RewriteRule ^feed/?$ feed.xml [R=303,L]

  # Restrict rewriting URLs only to paths that do not actually exists
  RewriteCond %{SCRIPT_FILENAME} !-d
  RewriteCond %{SCRIPT_FILENAME} !-f
  # Redirect to script
  RewriteRule ^(.*)$ ./index.php?u=$1
</ifmodule>

<ifmodule mod_deflate.c>
  # Compress HTML, CSS, JavaScript, Text, XML and fonts
  AddOutputFilterByType DEFLATE image/svg+xml
  AddOutputFilterByType DEFLATE application/javascript
  AddOutputFilterByType DEFLATE application/x-javascript
  AddOutputFilterByType DEFLATE application/xhtml+xml
  AddOutputFilterByType DEFLATE application/xml
  AddOutputFilterByType DEFLATE image/x-icon
  AddOutputFilterByType DEFLATE text/css
  AddOutputFilterByType DEFLATE text/html
  AddOutputFilterByType DEFLATE text/javascript
  AddOutputFilterByType DEFLATE text/plain
  AddOutputFilterByType DEFLATE text/xml

  # Remove browser bugs (only needed for really old browsers)
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4\.0[678] no-gzip
  BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
  Header append Vary User-Agent
</ifmodule>

Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Methods "GET"
Header set Access-Control-Allow-Headers "Content-Type"