NGINX ANTILOOPA цикл по проксям, синий трактор едет к нам

000_default.conf

#
# Define default virtualhost on the every node
#
server {
    listen  80 default_server;
    server_name  _;
    return  306;
}

nginx_proxy_cycle.conf

#
# Main upstream proxy server
#

map $cookie_NGINX_PROXY_BACKEND_NODE $_node {
    default node01;
    node02 $cookie_NGINX_PROXY_BACKEND_NODE;
    node03 $cookie_NGINX_PROXY_BACKEND_NODE;
}

server {
    listen  80;
    server_name  server-name.tld;

    root   /usr/share/nginx/html;
    index  index.html index.htm;

    location / {
        set $NGINX_PROXY_BACKEND_ANTILOOPA 'start';  # mark first request
        try_files /dev/null @$_node;
    }

    location @node01 {
        add_header Set-Cookie NGINX_PROXY_BACKEND_NODE=node01;
        proxy_pass http://255.255.0.3;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_intercept_errors on;
        recursive_error_pages on;
        error_page 306 = @node02;
    }

    location @node02 {
        add_header Set-Cookie NGINX_PROXY_BACKEND_NODE=node02;
        proxy_pass http://255.255.0.4;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_intercept_errors on;
        recursive_error_pages on;
        error_page 306 = @node03;
    }

    location @node03 {
        add_header Set-Cookie NGINX_PROXY_BACKEND_NODE=node03;
        proxy_pass http://255.255.0.5;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_intercept_errors on;
        recursive_error_pages on;
        error_page 306 = @end;
    }

    location @end {
        recursive_error_pages on;
        error_page 464 = @node01;  # If not first run, go stop loop and raise 502
        if ($NGINX_PROXY_BACKEND_ANTILOOPA = 'start') {
            set $NGINX_PROXY_BACKEND_ANTILOOPA 'end';  # mark not first request
            return 464;  # First run, go to first node
        }
        if ($NGINX_PROXY_BACKEND_ANTILOOPA = 'end') {
            return 502;
        }
    }
}