Memcached error page not work fine

hi, all:
i use nignx and tomat on my web site, tomcat work on 14100 port,
i
want when tomcat error i can get the html from my memcache for response,
if html not found in memcache should response c.html to client!
but
i set “error_page 404 /c.html;” in @mem don’t work for me!
this is my url: http://localhost/pos/2.htm(2 is key for
memcache, 2
not found)
the response to client is nginx default 404 page with text:
404 Not Found
not my config c.html (command: error_page 404 /c.html;)
buy if i visit http://localhost/memtest/somepathnotfound c.html
response ok, why?
can everybody help me please ,thank all!

my nginx.conf:

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;

charset gbk;

    #access_log  logs/host.access.log  main;
    log_format  memc  'status=$status ip="$remote_addr"

time=“$time_local” req=“$request” args=“$args” args2=“$arg_PARAMETER”';

error_page 404 /c.html;
location / {
root html;
index index.html index.htm;
}

location ^~ /pos/ {
rewrite ^/pos/(.).(jsp|htm).$ /index.jsp?$1 last;
}

location ~* .(htm|jsp)$ {
#proxy_pass http://localhost:8081;
proxy_pass http://localhost:14100;
proxy_intercept_errors on;
error_page 500 502 503 504 @mem;
}

location @mem {
access_log logs/mem.log memc;
set $memcached_key $args;
memcached_pass 10.20.141.149:60001;
proxy_intercept_errors on;
default_type text/html;
error_page 404 /c.html;
}

location /memtest/ {
access_log logs/mem.log memc;
set $memcached_key $args;
memcached_pass 10.20.141.149:60001;
default_type text/html;
error_page 404 /c.html;
}

Hello!

On Wed, Jul 27, 2011 at 09:30:15PM +0800, m zy wrote:

    buy if i visit http://localhost/memtest/somepathnotfound c.html

response ok, why?
can everybody help me please ,thank all!

http://wiki.nginx.org/HttpCoreModule#recursive_error_pages

Maxim D.