nginx反向代理的问题

反代了一个wordpress, 源站是LNMP, 代理站是NGINX.

问题是源站更新以后, 代理站不更新,访问的首页仍然是昨天的内容. 后台可以登陆,但是cookies好像没有保存,回到前台还是未登陆的状态,这是什么原因?


###

proxy_temp_path /home/proxy_temp_dir;
proxy_cache_path /home/proxy_cache_dir levels=1:2 keys_zone=cache_one:500m inactive=30d max_size=30g;
client_body_buffer_size 512k;
proxy_connect_timeout 60;
proxy_read_timeout 60;
proxy_send_timeout 60;
proxy_buffer_size 32k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;
proxy_temp_file_write_size 128k;
proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
proxy_cache cache_one;

server {
listen 80;
server_name www.xxx.com;
location /
{
proxy_pass http://weihost;
proxy_cache_key $host$uri$is_args$args;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_cache_valid 200 304 12h;
expires 2d;
}

location ~ /purge(/.*)
{
allow 127.0.0.1;
deny all;
proxy_cache_purge cache_one $host$1$is_args$args;
}

location ~ .*\.(php|jsp|cgi|asp|aspx|flv|swf|xml)?$
{
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_pass http://weihost;
}
access_log off;
}