I use wamp to run the php program. by default, localhost can be accessed, and I cannot change to the local ip address.

If localhost can access the local server and change to the local ip address, the error 403 indicates that localhost can access the local server.
Switch to the ip address of the local machine. The Error 403 is returned.

Reply content:

Localhost can access the local server
Switch to the ip address of the local machine. The Error 403 is returned.

Configure the hosts file 127.0.0.1 localhost: 1 localhost

Assume that the local ip address is 192.168.31.81.

Hosts File

127.0.0.1 192.168.31.81

Httpd-vhosts.coonf

  
   
DocumentRoot "F:/wamp/www/XXXX/" ServerName 192.168.31.81

   
    
Options Indexes FollowSymLinks Order allow, deny Allow from all