// 说明：获取当前页面的url地址
function GetCurrentpageURL()
{
  $pageURL = 'http';

  if ($_SERVER["HTTPS"] == "on")
  {
    $pageURL .= "s";
  }
  $pageURL .= "://";

  if ($_SERVER["SERVER_PORT"] != "80")
  {
    $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
  }
  else
  {
    $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
  }
//    echo $_SERVER["SERVER_NAME"].PHP_EOL;
//    echo $pageURL;die;
  return $pageURL;
}

server {
    listen 80;
    server_name origin.baidu.com back.baidu.com;
    //something

server {
    listen 80;
    server_name  back.baidu.com origin.baidu.com;
    //something