Why does Apache sometimes prompt you to enter the password twice when you access a file?

Article Title: Why does Apache sometimes prompt you to enter the password twice when you access a file. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
Problem Analysis: if the host name of the server you access is different from the ServerName defined in the Apache configuration file, when a request to reference its own URL is generated, apache redirects your request to a new host name based on the settings of the UseCanonicalName attribute. for example, if you access a directory without adding a trailing slash, apache first requires verification on the original page and then executes redirection. because the host name has changed, Apache then requires verification on the page of the new host name. Two verification requests are required.
Solution:
1. add a slash at the end of each access to the directory;
2. use the ServerName defined in the Apache configuration file for access, or set UseCanonicalName off in the Apache configuration file.