按照网上的说明安装了php服务器，测试时却无法通过。
经过搜索，发现是由于权限问题导致，记录如下：
If you open your /etc/php5/fpm/pool.d/www.conf file, you'll notice that fastcgi is listening to /var/run/php5-fpm.sock. You'll need to grant your webserver privileges to the unix socket by uncommenting the following lines:
listen.owner = www-data
listen.group = www-data
listen.mode = 0660