Environment Variables

Environment variables contain values that identify the server, browser and their capabilities allowing them to communicate. Facilities exist in various scripting languages and in Server Side Includes allowing the webmaster to access these values during runtime to determine how best to deliver a web page. These values are used at the server, but many values are retreived from the client.

This list is incomplete, but covers most of the variables supported on most servers. See our Cheatsheet to see how to use these webserver variables from Server Side Includes.

One of these days, each variable will be clickable and will have its own short tutorial. For now, here's the list.

AUTH_TYPE
CONTENT_TYPE
CONTENT_LENGTH
DATE_LOCAL
DATE_GMT
DOCUMENT_NAME
DOCUMENT_ROOT
DOCUMENT_URI
GATEWAY_INTERFACE
HTTP_ACCEPT
HTTP_FROM
HTTP_REFERRER
HTTP_USER_AGENT
LAST_MODIFIED
PATH_INFO
PATH_TRANSLATED
QUERY_STRING
QUERY_STRING_UNESCAPED
REMOTE_IDENT
REMOTE_USER
REQUEST_METHOD
SERVER_NAME
SERVER_PORT
SERVER_PROTOCOL

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Environment Variables