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

server {
    listen 3000;
    listen [::]:3000;
    server_name _;

    location = / {
        return 302 $scheme://$http_host/ssh/host/127.0.0.1;
    }

    location = /ssh {
        return 302 $scheme://$http_host/ssh/host/127.0.0.1;
    }

    location = /ssh/host {
        return 302 $scheme://$http_host/ssh/host/127.0.0.1;
    }

    location ~ ^/ssh/host/(?!127\.0\.0\.1(?:/|$)).+ {
        return 302 $scheme://$http_host/ssh/host/127.0.0.1;
    }

    location / {
        proxy_pass http://127.0.0.1:3001;
        proxy_http_version 1.1;
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        proxy_read_timeout 3600;
        proxy_send_timeout 3600;
    }
}