ubuntu下安装apache httpd + mod_proxy
1.安装httpd
sudo apt-get install apache2

2.安装mod_proxy

cd /etc/apache2/mods-available
sudo a2enmod proxy_http

3.配置一下mod_proxy
修改/etc/apache2/sites-available/default
　　
加入
ProxyPass / http://localhost:8781/
ProxyPassReverse / http://localhost:8781/

修改/etc/apache2/mods-enabled/proxy.conf
把"deny from all" 改成 "allow from all" #如果不改这个，浏览器就会说“You don't have permission to access...”