在drupal中清除索引页面的缓存

I have tried the code below to clear the cache of the index page to show the latest content to the user.

<filesMatch "index.html">
  FileETag None
  <ifModule mod_headers.c>
     Header unset ETag
     Header set Cache-Control "max-age=0, no-cache, no-store, must-revalidate"
     Header set Pragma "no-cache"
     Header set Expires "Wed, 11 Jan 1984 05:00:00 GMT"
  </ifModule>
</filesMatch> 

But when I try this code it gives forbidden error.