Nginx 代理微信图片防盗链，去掉referer

##配置图片开头
    location ~ /(mmbiz_|sz_mmbiz)(.*)/ {
        proxy_pass         https://mmbiz.qpic.cn;
        proxy_set_header   Host             "mmbiz.qpic.cn";
        proxy_set_header   Referer          "";
        expires 365d;
        valid_referers none blocked *.youphp.com;##配置只允许你的域名访问
        if ($invalid_referer) {
          return 404;
        }
    }

    sub_filter "http://mmbiz.qpic.cn" "";
    sub_filter_once off;