ServerSignature
Off
The ServerSignature directive allows the configuration of a
trailing footer line under server-generated documents (error
messages, mod_proxy ftp directory listings, mod_info output, ...).
The reason why you would want to enable such a footer line is that
in a chain of proxies, the user often has no possibility to tell
which of the chained servers actually produced a returned error
message.
The Off setting, which is the default, suppresses the
error line (and is therefore compatible with the behavior of
Apache-1.2 and below). The On setting simply adds a
line with the server version number and
ServerName of the serving virtual host, and the
EMail setting additionally creates a "mailto:" reference to
the ServerAdmin of the referenced
document.