[tank]
plugin_web=yatank_OnlineReport

http {

    <...>

    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    upstream backend {
      server 127.0.0.1:8001;
    }

    server {

        <...>

        location / {

            proxy_pass http://backend;

            proxy_http_version 1.1;

            proxy_set_header Host $host;
            proxy_set_header Origin $upstream_addr;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;

        }

        <...>

    }
}