用途：当系统运行久了，不可避免的文件空间不足，但想不改系统代码，将久远的文件迁移到他出，正好文件存储路径都带有年份，这就好办了。

（代码用AI生成，尚未测试，这种简单逻辑应该问题不大）

server {
    listen 80;
    listen 443 ssl;
    server_name www.abc.com;

    # ... SSL 配置 ...

    location /file/download/ {
        if ($args ~ ^url=upfiles/(files|img)/(\d{4})/) {
            set $captured_year $2;
        }
        if ($captured_year <= 2020) {
            return 301 $scheme://www.abcd.com$request_uri;
        }
        # 正常处理...
    }

    location ~ ^/upimg/(\d{4})/ {
        if ($1 <= 2020) {
            return 301 $scheme://www.abcd.com$uri$is_args$args;
        }
        # 正常处理...
    }
}

负载均衡：保持原有链接切换服务器

# 定义内网存储服务器
upstream internal_storage {
    server 192.168.1.100:8080;  # 内网存储服务器地址
    server 192.168.1.101:8080;  # 可以配置多个
}

server {
    listen 80;
    listen 443 ssl;
    server_name www.abc.com;

    # ... SSL 配置 ...

    location /file/download/ {
        if ($args ~ ^url=upfiles/(files|img)/(\d{4})/) {
            set $captured_year $2;
        }

        if ($captured_year <= 2020) {
            # 使用内网upstream
            proxy_pass http://internal_storage;
            proxy_set_header Host internal-storage.local;
            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;

            # 添加内网访问标识（可选）
            add_header X-Internal-Access "true";

            # 禁止响应头中的跳转指令
            proxy_redirect off;
            break;
        }

        # 正常处理2020年之后的文件...
    }

    location ~ ^/upimg/(\d{4})/ {
        set $img_year $1;

        if ($img_year <= 2020) {
            # 使用内网upstream
            proxy_pass http://internal_storage;
            proxy_set_header Host internal-storage.local;
            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;

            # 添加内网访问标识（可选）
            add_header X-Internal-Access "true";

            # 禁止响应头中的跳转指令
            proxy_redirect off;
            break;
        }

        # 正常处理2020年之后的图片...
    }
}

判断指定状态码进行轮询其它内网IP，配置超时

upstream internal_storage {
    server 192.168.1.100:8080 max_fails=3 fail_timeout=30s;
    server 192.168.1.101:8080 max_fails=3 fail_timeout=30s;

    # 大文件下载使用最少连接算法
    # least_conn;
    keepalive 32;
}

server {
    listen 80;
    listen 443 ssl;
    server_name www.abc.com;

    # ==================== 处理 /file/download/ 路径 ====================
    location /file/download/ {

        proxy_pass http://internal_storage;
        proxy_set_header Host internal-storage.local;
        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;

        # 禁止响应头中的跳转指令
        proxy_redirect off;

        # ========== 大文件下载专用超时配置 ==========

        proxy_connect_timeout 10s;  # 连接超时
        # 读取超时（关键）- 大文件下载需要很长时间
        proxy_read_timeout 3600s;   # 1小时 读取响应数据的超时
        proxy_send_timeout 10s;     # 发送超时

        # ========== 缓冲配置 ==========
        # 禁用缓冲，让数据直接传输，避免超时
        proxy_buffering off;

        # 禁用临时文件
        proxy_max_temp_file_size 0;

        # ========== 重试配置 ==========
        proxy_intercept_errors on;
        proxy_next_upstream error timeout invalid_header
                            http_500 http_502 http_503 http_504
                            http_401 http_403;
        proxy_next_upstream_tries 2; #最多尝试2台服务器
        proxy_next_upstream_timeout 60s;   # 重试总超时时间

        # 添加调试头
        add_header X-Internal-Access "true";
        add_header X-Upstream-Addr $upstream_addr;
        add_header X-Upstream-Status $upstream_status;

    }

    # ==================== 处理 /upimg/ 路径 ====================
    location /upimg/ {

        proxy_pass http://internal_storage;
        proxy_set_header Host internal-storage.local;
        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;

        # 禁止响应头中的跳转指令
        proxy_redirect off;

        # ========== 图片等小文件超时配置 ==========
        proxy_connect_timeout 10s; # 连接超时
        # 读取超时（关键）- 大文件下载需要很长时间
        proxy_read_timeout 30s;   # 30秒 读取响应数据的超时
        proxy_send_timeout 10s;     # 发送超时

        # ========== 缓冲配置 ==========
        # 小文件开启缓冲，提高性能
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 32 4k;
        proxy_busy_buffers_size 64k;

        # ========== 重试配置 ==========
        proxy_intercept_errors on;
        proxy_next_upstream error timeout invalid_header
                            http_500 http_502 http_503 http_504
                            http_302 http_404;
        proxy_next_upstream_tries 2; #最多尝试2台服务器
        proxy_next_upstream_timeout 10s;

        add_header X-Internal-Access "true";
        add_header X-Upstream-Addr $upstream_addr;
        add_header X-Upstream-Status $upstream_status;

    }
}