198
Chapter 14. Apache HTTP Server
authuser
If authentication was required, this is the username with which the user identified herself. Usu 
ally, this is not used, so you will see a
in its place.
[date]
The date and time of the request.
"request"
The request string exactly as it came from the browser or client.
status
The HTTP status code which was returned to the browser or client.
bytes
The size of the document.
referer
This can give the URL of the webpage which linked to the the current request.
user agent
This gives the name of the browser or client making the request.
14.5.42.
ServerSignature
The
ServerSignature
directive adds a line containing the Apache server version and the
Server 
Name
of the serving host to any server generated documents (for example, error messages sent back
to clients).
ServerSignature
is set to
on
by default. You can change it to
off
, so no signature line
will be added, or you can change it to
EMail
.
EMail
will add a
mailto:ServerAdmin
HTML tag
to the signature line.
14.5.43.
Alias
The
Alias
setting allows directories to be outside the
DocumentRoot
directory and yet still acces 
sible to the Web server. Any URL ending in the alias will automatically resolve to the alias' path. By
default, one alias is already set up. An
icons
directory can be accessed by the Web server, but the
directory is not in the
DocumentRoot
. The
icons
directory, an alias, is actually
/var/www/icons/
,
not
/var/www/html/icons/
.
14.5.44.
ScriptAlias
The
ScriptAlias
setting defines where CGI scripts (or other types of scripts) can be found. Gener 
ally, you do not want to leave CGI scripts within the
DocumentRoot
. If CGI scripts are in
Documen 
tRoot
, they could potentially be viewed as text documents. Even if you do not care if people can see
and then use your CGI scripts, revealing how they work creates opportunities for unscrupulous people
to exploit any security holes in the script and may create a security risk for your server. By default,
the
cgi bin
directory is a
ScriptAlias
of
/cgi bin/
and is actually located in
/var/www/cgi 
bin/
.
Your
/var/www/cgi bin
directory has
Options ExecCGI
set, meaning that execution of CGI
scripts is permitted within that directory.






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