server {
    listen 5138;
    server_name localhost;

    # gzip 压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1k;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml text/javascript application/json application/javascript application/xml+rss application/rss+xml font/truetype font/opentype application/vnd.ms-fontobject image/svg+xml;
    gzip_disable "MSIE [1-6]\.";

    # 静态文件目录
    root /usr/share/nginx/html;
    index index.html;

    # 访问日志
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    # 前端路由 fallback
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API 代理 - 代理所有后端 API 请求
    # 匹配常见的后端 API 路径前缀
    location ~ ^/(system|chat|auth|resource|agent|knowledge|workflow)/ {
        proxy_pass ${UPSTREAM_URL};
        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;

        # 超时设置
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # 支持 WebSocket
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # 兼容 /api 前缀的请求
    location /api {
        proxy_pass ${UPSTREAM_URL};
        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;

        # 超时设置
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # 支持 WebSocket
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # 静态资源缓存
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # 禁止访问隐藏文件
    location ~ /\. {
        deny all;
    }
}