server {
    listen 8888;
    server_name localhost;

    # 前端代理（Vite等开发服务器）
    location / {
        proxy_pass http://127.0.0.1:5173;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # 后端代理及CORS配置（API/Ollama/OpenAI等）
    location ~ ^/(api|ollama|openai|ws)/ {
        # 动态验证来源（防止伪造Origin）
        if ($http_origin ~* (localhost:5173|yourdomain.com)) {
            set $cors_origin $http_origin;
        }
        
        # CORS核心响应头（必须用变量动态匹配来源）
        add_header 'Access-Control-Allow-Origin' $cors_origin always;  # 
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;  # 必须与前端credentials模式匹配
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;

        # 处理OPTIONS预检请求（需返回详细头部）
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;  # 
        }

        # 反向代理到后端
        proxy_pass http://127.0.0.1:8080;
        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;
    }
}