Save this page in your server as "aspvariables.shtml".
Description
Code
Result 
size of input posted from client <!--#echo var="QUERY_STRING"-->
size of input posted from client <!--#echo var="CONTENT_LENGTH"-->
MIME type of content <!--#echo var="CONTENT_TYPE"-->
The current GMT time <!--#echo var="DATE_GMT"-->
current time/date <!--#echo var="DATE_LOCAL"-->
complete local directory path of the current document. <!--#echo var="DOCUMENT_NAME"-->
local path of the current document referenced to the base directory of the web space <!--#echo var="DOCUMENT_URI"-->
date and time of the last modification of the current document <!--#echo var="LAST_MODIFIED"-->
URL of the document the client came from <!--#echo var="HTTP_REFERER"-->
Numeric IP address of the client <!--#echo var="REMOTE_ADDR"-->
domain name of the client <!--#echo var="REMOTE_HOST"-->
user name used to validate authentication from the remote client <!--#echo var="REMOTE_USER"-->
HTTP method: GET OR POST <!--#echo var="REQUEST_METHOD"-->
server host name <!--#echo var="SERVER_NAME"-->
the port used by httpd <!--#echo var="SERVER_PORT"-->
Which version of Httpd compliance <!--#echo var="SERVER_PROTOCOL"-->
The name of the HTML server software <!--#echo var="SERVER_SOFTWARE"-->
name of the proxy server through which this document is being processed <!--#echo var="FORWARDED"-->
name of the proxy server through which this document is being processed <!--#echo var="HTTP_X_FORWARDED_FOR"-->
unescaped query string sent by the client browser, all shell-special characters escaped with \ <!--#echo var="QUERY_STRING_UNESCAPED"-->
name/version of the Common Gateway Interface <!--#echo var="GATEWAY_INTERFACE"-->
path info that is sent <!--#echo var="PATH_INFO"-->
'PATH_INFO' variable translated from virtual to local (physical) disk location <!--#echo var="PATH_TRANSLATED"-->
virtual path of the script being executed <!--#echo var="SCRIPT_NAME"-->
comma separated list of mime types that are accepted by the remote browser <!--#echo var="HTTP_ACCEPT"-->
name of the remote client browser software <!--#echo var="HTTP_USER_AGENT"-->

Below you will find the environmental variables in the table and a few additional ones:
 

ALL_HTTP
ALL_RAW
APPL_MD_PATH
APPL_PHYSICAL_PATH
AUTH_PASSWORD
AUTH_TYPE
AUTH_USER
CERT_COOKIE
CERT_FLAGS
CERT_ISSUER
CERT_KEYSIZE
CERT_SECRETKEYSIZE
CERT_SERIALNUMBER
CERT_SERVER_ISSUER
CERT_SERVER_SUBJECT
CERT_SUBJECT
CONTENT_LENGTH
CONTENT_TYPE
GATEWAY_INTERFACE
HTTPS
HTTPS_KEYSIZE
HTTPS_SECRET_KEYSIZE
HTTPS_SERVER_ISSUER
HTTPS_SERVER_SUBJECT
INSTANCE_ID
INSTANCE_META_PATH
LOCAL_ADDR
LOGON_USER
PATH_INFO
PATH_TRANSLATED
QUERY_STRING
REMOTE_ADDR
REMOTE_HOST
REMOTE_USER
REQUEST_METHOD
SCRIPT_NAME
SERVER_NAME
SERVER_PORT
SERVER_PORT_SECURE
SERVER_PROTOCOL
SERVER_SOFTWARE
URL
HTTP_PRAGMA
HTTP_HOST
HTTP_ACCEPT_ENCODING
HTTP_ACCEPT_LANGUAGE
HTTP_ACCEPT_CHARSET
HTTP_COOKIE
HTTP_VIA
HTTP_X_FORWARDED_FOR
HTTP_CACHE_CONTROL
HTTP_ACCEPT
HTTP_USER_AGENT
HTTP_REFERER
ASP_VERSION
ASP_VERSION_MAJOR
ASP_VERSION_MINOR
ASP_OS