CGI Environment Variables

by Jeff Hunter, Sr. Database Administrator

Introduction

The following environment variables are defined by the current Common Gateway Interface standard.

All other request headers are supplied as environment variables with the prefix HTTP_ and all hyphens replaced by an underscore. Headers that have already been included (e.g., Content-length) may be omitted.

CGI Environment Variables

CGI Environment Variables
Variable	Function
SERVER_SOFTWARE	Identifies the server software
SERVER_NAME	Identifies server address
GATEWAY_INTERFACE	Identifies the CGI version in use
SERVER_PROTOCOL	Specifies the request protocol
SERVER_PORT	Specifies the server port
REQUEST_METHOD	Specifies the request method
PATH_INFO	Specifies the request path info
PATH_TRANSLATED	Specifies the translated request path info
SCRIPT_NAME	Specifies the script's virtual path
QUERY_STRING	Specifies the request query string
REMOTE_HOST	Specifies the remote hostname
REMOTE_ADDR	Specifies the remote IP address
AUTH_TYPE	Specifies user authentication method
REMOTE_USER	Specifies the remote user, if authenticated
REMOTE_IDENT	Specifies the remote username if determined (RFC 931)
CONTENT_TYPE	Specifies the request content type
CONTENT_LENGTH	Specifies the request content length