My host is a ubuntu16.04 host of alicloud. Nginx has been successfully installed. When I visit the IP (e.g. 0.0.0), the nginx welcome page is displayed, but I visit 0.0.0.0/ index.html Display 404, input curl 127.0.0.1 in the host/ index.html Open is the 404 page file. That is to say, all files in the root directory have no routing. How can I solve this problem?