server {
    listen 80;
    server_name _;

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

    # SPA 路由回退
    location / {
        try_files $uri $uri/ /index.html;
    }

    # 反代到后端引擎，前端无需硬编码后端地址
    location /api/ {
        proxy_pass http://engine:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}