REMOTE_HOST
The hostname of the client making the request.
<!--#echo var="REMOTE_HOST" -->
REMOTE_ADDR
The IP address of the client making the request.
<!--#echo var="REMOTE_ADDR" -->
AUTH_TYPE
The authentication method used to validate the user.
<!--#echo var="AUTH_TYPE" -->
REMOTE_USER
If a page is protected, this is the name the user has
authenticated as.
<!--#echo var="REMOTE_USER" -->
REMOTE_IDENT
For servers that support the RFC 931 identification, this
variable returns the client user name retrieved from the
server. REMOTE_USER should be limited to logging only.
<!--#echo var="REMOTE_IDENT" -->
CONTENT_TYPE
This is the content type of the data for queries which have
attached information such as HTTP POST and PUT.
<!--#echo var="CONTENT_TYPE" -->
CONTENT_LENGTH
The length of the attached information as given by the client.
<!--#echo var="CONTENT_LENGTH" -->
HTTP_ACCEPT
A list of MIME types which the client will accept.
List items should be separated by commas.
<!--#echo var="HTTP_ACCEPT" -->
HTTP_USER_AGENT
The browser software the client is using.
The return on this takes the format of
software/version library/version, e.g.
Apache/1.2.6 FrontPage/3.0.4
<!--#echo var="HTTP_USER_AGENT" -->
HTTP_REFERER
URL of the document that contained the link to the page.
<!--#echo var="HTTP_REFERER" -->
