在CodeIgniter框架下，http://localhost/index.php可以正常访问
但这样访问时http://localhost/index.php/welcome/页面报错500 Internal Server Error
查看nginx错误日志发现
open() “/usr/share/nginx/test/index.html” failed (2: No such file or directory)
居然访问的是index.html而不是index.php
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