1.配置本地hosts
2.配置虚拟机apache vhosts
3.配置虚拟机hosts
4.加载REST_Client.php和Curl.php
5．constans.php =>
$autoload['libraries']=array('uri','database','REST_Client');
define('BASE_URL','http://home.loc');
define('BLL_API_URL','http://newsbll.loc/index.php/');//业务逻辑层接口主机
6. config.php => $config['base_url'] = BASE_URL;
7.bll写方法并返回值
8.view层请求bll对应方法
$this->rest_client->initialize(array("server"=>BLL_API_URL));
$res = $this->rest_client->get();
