server {
    server_name testcadmin.dot-dot.ru;
    client_max_body_size 10m;

    location / {
        proxy_pass http://dashboard:80;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        chunked_transfer_encoding off;
        proxy_buffering off;
        proxy_cache off;
    }
}