If it is under apache, the configuration is as follows:
Method 1:
httpd.conf开启mod_autoindexModule (enabled by default)
Turn on directory listing function:
Options +Indexes
Turn off directory listing function:
Options -Indexes
Method 2:
Add .htaccess to the root directory

 <Files *>
  Options -Indexes
 </Files>

<VirtualHost *>
    DocumentRoot ./htdocs/book
    ServerName www.book.com
    ErrorLog logs/boook-error_log

    <Directory "./htdocs/book">
        Options Indexes
        Order allow,deny
        IndexOptions NameWidth=25 Charset=UTF-8 
        Allow from all
    </Directory>
</VirtualHost>

Try the above configuration, if it doesn’t work, change all paths in the configuration to absolute paths and try again,

apache