map '$request_method $query_string $http_cookie $request_uri' $cache_uri {
'POST ~* ~* ~*' null-cache;
'~* ~*(.+) ~* ~*' null-cache;
'~* ~* ~*(comment_author|wordpress_[a-f0-9]+) ~*' null-cache;
'~* ~* ~* ~*(/wp-admin/|/xmlrpc.php)' null-cache;
default $request_uri;
}