server {
    listen 7860;
    server_name localhost;
    
    # 设置较长的超时时间，防止大模型生成时断连
    proxy_read_timeout 300s;
    proxy_connect_timeout 300s;

    # 后端 API 转发 (保持原样)
    location /api {
        proxy_pass http://127.0.0.1:5001;
        # 后端通常需要真实的 Host 信息，所以这里保持 $host
        proxy_set_header Host $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;
    }

    # 前端转发 (关键修改)
    location / {
        proxy_pass http://127.0.0.1:3000;
        
        # [修复] 强制将 Host 头设置为 localhost
        # 这样 Vite 就会认为请求来自本地，从而通过 allowedHosts 检查
        proxy_set_header Host "localhost";
        
        # WebSocket 支持 (用于热更新和实时通信)
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        
        # 传递真实 IP
        proxy_set_header X-Real-IP $remote_addr;
    }
}