Мой вариант .htaccess

server {
    listen 80;
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    location / {
        root /var/site;
        rewrite ^/index(\.\w+)?$ / permanent; # редирект c index-ов на корень
        rewrite ^/(.+)\.\.html /$1.en.html permanent; # добавляем в ".." дефолтный язык
        rewrite ^/(.+?)/?$(?<!\.html) $1.html permanent; # добавляем .html, заодно убираем слеш
        try_files $uri /test.php?URI=$uri; # если файла нету - нехай его сделает бекенд
    }

    location ~^/([^/]*\.php)$ { # скармливаем пыху скрипты в докруте, включая фронт контроллер
        fastcgi_param SCRIPT_FILENAME /var/site/$fastcgi_script_name;
        fastcgi_param QUERY_STRING $args;
        include fastcgi_params;
        fastcgi_pass 127.0.0.1:9000;
    }
}

AddDefaultCharset utf8
RewriteEngine on
RewriteBase /

# CSS & JS Versioning Routing
# style.123.css equal to style.css
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)\.(\d+)\.(js|css)$ $1.$3 [L]

# General Routing
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /index.php [L,QSA]

#Expiring
<IfModule mod_expires.c>
  ExpiresActive on
  # Dynamic
  ExpiresByType text/html                 "access plus 0 seconds"
  ExpiresByType text/xml                  "access plus 0 seconds"
  ExpiresByType application/xml           "access plus 0 seconds"
  ExpiresByType application/json          "access plus 0 seconds"
  # Images
  ExpiresByType image/x-icon              "access plus 1 week"
  ExpiresByType image/gif                 "access plus 1 month"
  ExpiresByType image/png                 "access plus 1 month"
  ExpiresByType image/jpg                 "access plus 1 month"
  ExpiresByType image/jpeg                "access plus 1 month"
  # Fonts
  ExpiresByType application/x-font-ttf    "access plus 1 month"
  ExpiresByType font/opentype             "access plus 1 month"
  ExpiresByType application/x-font-woff   "access plus 1 month"
  ExpiresByType image/svg+xml             "access plus 1 month"
  # JS & CSS because of versioning
  ExpiresByType text/css                  "access plus 1 year"
  ExpiresByType application/javascript    "access plus 1 year"
</IfModule>

#Disable ETag because of Expiring
<IfModule mod_headers.c>
  Header unset ETag
</IfModule>
FileETag None

# Disable Indexing of folders
<IfModule mod_autoindex.c>
  Options -Indexes
</IfModule>

Сразу важный момент: выключена автоматическая подстановка слеша в конец и выключен MultiViews (с ним работать не будет).