基于 Nginx 的网关级 HTTP 透明代理

出于某些需求在网关级架设 HTTP 透明代理,劫持用户 HTTP 请求,转发或直接进行响应。

iptables 配置
iptables 用于将经过网关的 TCP 80 端口的上行流量转发至网关上的 Nginx 服务。

sudo iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j DNAT \
--to-destination 网关IP:端口

Nginx 演示配置

worker_processes  1;
 
events {
    worker_connections  1024;
}
 
http {
    include       mime.types;
    default_type  application/octet-stream;
 
    sendfile        on;
    keepalive_timeout  65;
 
    server {
        listen       8000;
        server_name  localhost;
 
        resolver 8.8.8.8;
 
        location /test {
            proxy_pass http://hev.cc/sftp/files/;
            proxy_buffers 256 4k;
            proxy_max_temp_file_size 0k;
        }
 
        location / {
            # 包含关键词 '计算机' 重定向至 /test
            rewrite ^.*计算机.*$ /test last;
 
            # 通用透明代理
            proxy_pass $scheme://$host$request_uri;
            proxy_set_header Host $http_host;
            proxy_buffers 256 4k;
            proxy_max_temp_file_size 0k;
        }
    }
 
    # 匹配 *.baidu.com 域名
    server {
        listen       8000;
        server_name  *.baidu.com;
 
        location / {
            root   html;
            index  index.html index.htm;
        }
    }
}

Over!

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