Red Hat LINUX 7.2 Reference Manual page 206

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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 Web page which linked to the the current request.
user-agent
This gives the name of the browser or client making the request.
13.3.48 ServerSignature
The ServerSignature directive adds a line containing the Apache server version and
the ServerName 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.
13.3.49 Alias
The Alias setting allows directories to be outside the DocumentRoot directory and yet still ac-
cessible 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/.
13.3.50 ScriptAlias
The ScriptAlias setting defines where CGI scripts (or other types of scripts) can be found. Gen-
erally, you do not want to leave CGI scripts within the DocumentRoot. If CGI scripts are in Doc-
umentRoot, 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 unscrupu-
lous 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.
See Section 13.3.65, AddHandler and Section 13.3.29, Directory for instructions on how to
execute CGI scripts in directories other than the cgi-bin.
Chapter 13:Apache