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For Apache, use the Location directive into your virtual host(be sure you have included expires and headers modules)

<LocationMatch "^/assets/.*$">
  Header unset ETag
  FileETag None
  ExpiresActive On
  ExpiresDefault "access plus 30 days"
</LocationMatch>


For nginx

location ~ ^/assets/ {
  expires 30d;
  add_header Cache-Control public; 
  add_header ETag "";
  break;
}