June 2002
Beginner
759 pages
80h 42m
English
Content preview from Perl in a Nutshell, 2nd Edition
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CGI Environment Variables
Most of the information needed by CGI programs is made
available via Unix environment variables. Programs can access this
information as they would any environment variable (via the %ENV hash in Perl). The table below lists
environment variables commonly available through CGI. However, since
servers occasionally vary on the names of environment variables they
assign, check with your own server documentation for more
information.
Environment variable | Content returned |
|---|---|
AUTH_TYPE | The authentication method used to validate a user. See REMOTE_IDENT and REMOTE_USER. |
CONTENT_LENGTH | The length of the query data (in bytes or the number of characters)passed to the CGI program through standard input. |
CONTENT_TYPE | The media type of the query data, such as
|
DOCUMENT_ROOT | The directory from which web documents are served. |
GATEWAY_INTERFACE | The revision of the Common Gateway Interface that the server uses. |
HTTP_ACCEPT | A list of the media types that the client can accept. |
HTTP_COOKIE | A list of cookies defined for that URL. |
HTTP_FROM | The email address of the user making the query (many browsers do not support this variable). |
HTTP_REFERER | The URL of the document the client read before accessing the CGI program. |
HTTP_USER_AGENT | The browser the client is using to issue the request. |
PATH_INFO | Extra path information passed to a CGI program. |
PATH_TRANSLATED | The translated version of the path given by the variable PATH_INFO. |
QUERY_STRING | The query information passed to the program. It is appended ... |
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