.htaccess

# no cahce for root index redirection
<If "%{REQUEST_URI} =~ m#^/?([\w\-]+\.html)?$#">
    <IfModule mod_expires.c>
        ExpiresActive off
    </IfModule>

    <IfModule mod_headers.c>
        Header always set Cache-Control "no-store, no-cache, must-revalidate"
        Header always set Expires "Thu, 01 Dec 1994 16:00:00 GMT"
        Header always merge Vary "Accept-Language"
    </IfModule>
</If>

<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{SERVER_PORT} !^443$
  RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

  RewriteCond "%{HTTP:Accept-Language}" ^zh [NC]
  RewriteRule ^/?(index\.html)?$ "/zh/index.html" [L,R=302]

  RewriteRule ^/?(index\.html)?$ "/en/index.html" [L,R=302]

  # special redirection for examples & handbook
  RewriteCond "%{HTTP:Accept-Language}" ^zh [NC]
  RewriteRule ^/?faq/?([\w\-/]+)?$ "/zh/docs3-v2/java-sdk/faq/$1" [L,R=302]

  RewriteRule ^/?faq/?([\w\-/]+)?$ "/en/docs/java-sdk/faq/$1" [L,R=302]

  RewriteCond "%{HTTP:Accept-Language}" ^zh [NC]
  RewriteRule ^/?([\w\-]+)\.html$ "/zh/$1.html" [L,R=302]

  RewriteRule ^/?([\w\-]+)\.html$ "/en/$1.html" [L,R=302]

</IfModule>