nginx连接后端开启keeplive， 解决time_wait 过多问题

upstream gmweb_click
        {
          server localhost:9500 max_fails=2 fail_timeout=30s;
          keepalive 128; # 添加keepalive
        }


server  {
          server_name xx.com;
          listen  80;
          listen 443;
          ssl on;
          ssl_certificate /usr/local/nginx/conf/ssl/xx.crt;
          ssl_certificate_key /usr/local/nginx/conf/ssl/xx.key;
          location / {
                 proxy_pass http://gmweb_click;
                 proxy_set_header Host $host;
                 proxy_set_header X-Real-IP $remote_addr;
                 proxy_set_header X-Forwarded-For $remote_addr;
                 proxy_connect_timeout   600;
                 proxy_send_timeout      600;
                 proxy_read_timeout      600;
                 proxy_http_version 1.1;
                 proxy_set_header Connection "";
                 add_header Access-Control-Allow-Origin *;
          }
          if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})")
          {
                set $year $1;
                set $month $2;
                set $day $3;
          }
          access_log /data/nginx_logs/xx.access.log main;
          error_log  /data/nginx_logs/xx.com.error.log;
}