nginx.conf

worker_processes 1;
pid /tmp/nginx.pid;
error_log /tmp/nginx_error.log;

events {
    worker_connections 1024;
}

http {
    access_log /tmp/nginx_access.log;
    client_body_temp_path /tmp/nginx_client_temp;
    proxy_temp_path /tmp/nginx_proxy_temp;
    client_max_body_size 50M;

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

    server {
        listen 7860;

        location / {
            # magentic-ui hardcodes a Host-header allowlist of only
            # localhost/127.0.0.1 (DNS-rebinding defense) with no override,
            # which rejects HF's proxy Host header outright. Rewrite it here
            # instead of patching magentic-ui's source.
            proxy_pass http://127.0.0.1:8081;
            proxy_set_header Host localhost;

            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_read_timeout 3600s;
            proxy_send_timeout 3600s;
        }
    }
}