Webmaster in a Nutshell, 3rd Edition By Robert Eckstein, Stephen Spainhour
Table of Contents
Chapter 18. Apache Configuration
UseCanonicalName
UseCanonicalName onoffdns
[ server config , within <Directory>, or <VirtualHost>]
Used to build a self-referential URL. If on, Apache uses the <ServerName> directive to build a URL representing itself. If off, Apache attempts to construct its URL from the client parameters, which is typical when using the VirtualHost directive to represent different addresses. The dns value causes the server to use reverse DNS lookup to determine the self URL.
