Looking for help with TP5.1, the controller cannot be accessed

Question

I just downloaded it with almost no changes. I added a demo method in the index class of the index controller, and then accessed http://localhost/index/index/demo and found that it could not be accessed. The response was No input file specified. Then it was found that all methods could not be accessed. Baidu spent a long time but could not find a solution

Answer 1

localhost/tp directory/public/index.php/default index module/controller/method

Answer 2

Did you forget to add index.php?