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VARIABLE NAME	DESCRIPTION
AUTH_TYPE	When the browser authenticates itself, this variable contains the authentication type in use. The most common value is Basic.
COMSPEC	Reports the path to COMMAND.COM when run locally in Windows.
CONFIGS	If any server configuration options were set, this is a space-separated array of them all.
CONTENT_LENGTH	The length of the data (in bytes or the number of characters) passed to the CGI program through standard input.
CONTENT_TYPE	The MIME type of the query data, such as "text/html".
COOKIE_name	The value of the cookie name.
COOKIES	A space-separated list of all cookie names sent with this request.
DATE_GMT	Current date and time in GMT.
DATE_LOCAL	Current date and time in the local time zone.
DOCUMENT_NAME	The current file.
DOCUMENT_PATH_INFO	Additional path information passed to a document.
DOCUMENT_ROOT	The root directory of the server (so you can use the same script on multiple sites).
DOCUMENT_URI	Virtual path to the file.
GATEWAY_INTERFACE	The revision of the Common Gateway Interface that the server uses.
HTTP_ACCEPT	A list of the MIME types that the client can accept.
HTTP_ACCEPT_CHARSET	The contents of the HTTP Accept-Charset header of the request.
HTTP_ACCEPT_ENCODING	The contents of the HTTP Accept-Encoding header of the request.
HTTP_ACCEPT_LANGUAGE	The contents of the HTTP Accept-Language header of the request.
HTTP_AUTHORIZATION	The contents of the HTTP Authorization header of the request. It will only be available if the Raw user info variable has been set to Yes by the server administrator.
HTTP_CACHE_CONTROL	Information about how to handle the caching od the object requested.
HTTP_CONNECTION	A lowercased version of the HTTP Connection header; typically keep-alive.
HTTP_COOKIE	If you've set a cookie, this holds its value.
HTTP_FORWARDED	An old variant of the Via: header.
HTTP_FROM	The email address of the user making the request. Most browsers do not support this variable.
HTTP_HOST	The net_loc part of the URL, as sent in the HTTP Host header, for instance localhost:4711.
HTTP_PRAGMA	If the client sent any pragma header(s), they are provided here. For practical purposes, the only pragma header you are likely to encounter is no-cache, which some browsers (Netscape comes to mind) send when the user reloads the page.
HTTP_PROXY_CONNECTION	The contents of the HTTP Proxy-Connection header of the request.
HTTP_REFERER	The URL of the document that the client points to before accessing the CGI program.
HTTP_UA_COLOR	The color information of the client.
HTTP_UA_CPU	The processor type used by the client.
HTTP_UA_OS	The operating system used by the client.
HTTP_UA_PIXELS	The screen resolution of the client.
HTTP_USER_AGENT	The browser the client is using to issue the request.
HTTP_VIA	Information about the proxy servers eventually used for making the request.
HTTPS	Returns 'true' if the server is secure.
INDEX	The query part of the URL, if present.
LAST_MODIFIED	Last modification date and time for current file.
PAGE_COUNT	Number of accesses to current document since server was brought on line.
PATH	The system path your system is running on.
PATH_INFO	Extra path information passed to a CGI program.
PATH_TRANSLATED	The translated version of the path given by the variable PATH_INFO.
PRESTATE_name	The value true if that prestate was present.
PRESTATES	If server found prestates in the URL, this is a space-separated array of those present.
PRINTENV	A special XSSI command which returns ALL environment variables, including those which have been set within the page. Note that, like flastmod and fsize, it is a directive in itself and does not require 'echo var=' in its argument.
QUERY_name	The value of the form variable name.
QUERY_STRING	The query information passed to the program. It is appended to the URL with a "?".
QUERY_STRING_UNESCAPED	Undecoded query string with all shell metacharacters escaped with "".
REDIRECT_SCRIPT_NAME	The virtual path of the parent document.
REDIRECT_STATUS	The status code of the parent request. It is useful when writing scripts that generate custom error pages.
REMOTE_ADDR	The remote IP address of the user making the request.
REMOTE_HOST	The remote hostname of the user making the request.
REMOTE_IDENT	The user making the request. This variable will only be set if NCSA IdentityCheck flag is enabled, and the client machine supports the RFC 931 identification scheme (ident daemon).
REMOTE_PASSWORD	The password used by the user, only available if the Send decoded password variable is set to Yes by the administrator and the client authenticated itself.
REMOTE_PORT	The port number used by the client.
REMOTE_USER	The authenticated name of the user.
REQUEST_METHOD	The method with which the information request was issued.
REQUEST_URI	The address of the requested document or CGI file, relative to the document root.
SCRIPT_FILENAME	The complete path in the real file system to the CGI script.
SCRIPT_NAME	The virtual path (e.g., /cgi-bin/program.pl) of the script being executed.
SCRIPT_URI	The absolute URL of the CGI script called.
SCRIPT_URL	The URL path of the CGI script called.
SERVER_ADDR	The server's DNS address.
SERVER_ADMIN	The e-mail address of your server's webmaster.
SERVER_NAME	The server's hostname or IP address.
SERVER_PORT	The port number of the host on which the server is running.
SERVER_PROTOCOL	The name and revision of the information protocol the request came in with.
SERVER_SIGNATURE	Used server error messages.
SERVER_SOFTWARE	The name and version of the server software that is answering the client request.
SERVER_URL	The URL to the web server. Together with SCRIPT_NAME, this makes up the complete URL for the script.
SUPPORTS	A list of words, separated with spaces, of all features for which support information is available.>
SUPPORTS_feature	The value true if that feature is supported by the current browser.
TOTAL_HITS	Total pages served by server since brought on line.
TZ	Time zone.
UNIQUE_ID	Serial no. of the server.
USER_INFO	Identity of current site as known by the server.
USER_NAME	The name of the user who started Apache.
VAR_name	The value of the form variable name.
VARIABLES	A list of all form variables.
WANTS_name	The value true if that server configuration option was set. See also CONFIGS.

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