wp super cache rewrite rule

[Max]

Hello,

When I look at the stats at wp super cace, it always show 0 page for wp
super cace:

Cache Contents

WP-Cache

    * 71 Cached Pages
    * 0 Expired Pages

WP-Super-Cache

    * 0 Cached Pages
    * 0 Expired Pages

Garbage Collection
Last: 2009-03-05 19:25:31
Next: 2009-03-05 19:35:31

I also look at the footer at my page, it shows:

<!-- Dynamic Page Served (once) in 0.080 seconds -->
<!-- Cached page generated by WP-Super-Cache on 2009-03-06 01:31:30 -->

So I don't know why teh wp-super-cache page is always 0. The following
is my rewrite rule. Does any body got a working rewrite rule for wp
suer cache? Thanks a lot.

                set $wp_super_cache_file '';
                set $wp_super_cache_uri $request_uri;

                if ( $request_method = POST )
                {
                        set $wp_super_cache_uri '';
                }

                if ( $query_string )
                {
                        set $wp_super_cache_uri '';
                }

                if ( $http_cookie ~*
"comment_author_|wordpress|wp-postpass_" )
                {
                        set $wp_super_cache_uri '';
                }

                if ( $wp_super_cache_uri ~ ^(.+)$ )
                {
                        set $wp_super_cache_file
/wp-content/cache/wp_super_cache/$http_host/$1index.html;
                }

                if ( -f $document_root$wp_super_cache_file )
                {
                        rewrite ^(.*)$ $wp_super_cache_file break;
                }

                if (-f $request_filename)
                {
                        expires 30d;
                        break;
                }

                if (!-e $request_filename)
                {
                        rewrite ^(.+)$ /index.php?q=$1 last;
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