http {
    # API服务负载均衡组
    upstream api-backend {
        server localhost:8011 weight=1 max_fails=3 fail_timeout=30s;
        server localhost:8012 weight=1 max_fails=3 fail_timeout=30s;
        
        # 负载均衡策略
        least_conn;          # 最少连接数
        
        # 连接池优化
        keepalive 32;
        keepalive_requests 100;
        keepalive_timeout 60s;
    }

    server {
        listen 80;
        server_name localhost;

        # API代理配置
        location /api/ {
            proxy_pass http://api-backend/;
            
            # 代理头设置
            proxy_set_header Host $http_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 5s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            
            # 缓冲设置
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
            
            # 重试设置
            proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;
            proxy_next_upstream_tries 2;
            proxy_next_upstream_timeout 3s;
        }
    }
}