HTTP Variables

Several variables in HTML extension files can give a lot of information about the environment and Web client connected to the server. In addition, all headers sent by the client are available. For Index Server to access these headers, you must convert them:

Add HTTP_ to the beginning
Convert all dashes to underscores.
Convert all letters to uppercase.

The following list gives a listing of default variables.

ALL_HTTP

All HTTP headers that were not already parsed into one of the listed variables. These variables are of the form HTTP_header field name with successive variables separated by a new line character, for example:

HTTP_ACCEPT: */*, q=0.300, audio/x-aiff, audio/basic, image/jpeg, image/gif, text/plain, text/html
HTTP_USER_AGENT: Microsoft Internet Explorer/0.1 (Win32)
HTTP_REFERER: http://webserver/samples/dbsamp/dbsamp3.htm
HTTP_CONTENT_TYPE: application/x-www-form-urlenPRE: 10
HTTP_EXTENSION: Security/Digest

AUTH_TYPE: The type of authorization in use. If the user name has been authenticated by the server, this will contain Basic. Otherwise, it will not be present.
CONTENT_LENGTH: The number of bytes that the script can expect to receive from the client.
CONTENT_TYPE: The content type of the information supplied in the body of a POST request.
GATEWAY_INTERFACE: The revision of the CGI (Common Gateway Interface) specification with which this server complies. The current version is CGI/1.1.

HTTP_ACCEPT: Special-case HTTP header. Values of the Accept: fields are concatenated, separated by “, ”; for example, if the following lines are part of the HTTP header: accept: */*; q=0.1 accept: text/html accept: image/jpeg then the HTTP_ACCEPT variable will have a value of: */*; q=0.1, text/html, image/jpeg.
PATH_INFO: Additional path information, as given by the client. This comprises the trailing part of the URL after the script name but before the query string (if any).
PATH_TRANSLATED: This is the value of PATH_INFO, but with any virtual path name expanded into a directory specification.
QUERY_STRING: The information that follows the question mark (?) in the URL that referenced this script.
REMOTE_ADDR: The IP address of the client.
REMOTE_HOST: The hostname of the client.
REMOTE_USER: This contains the user name supplied by the client and authenticated by the server.
REQUEST_METHOD: The HTTP request method.
SCRIPT_NAME: The name of the script program being run.
SERVER_NAME: The server’s hostname (or IP address) as it should appear in self-referencing URLs.
SERVER_PORT: The TCP/IP port on which the request was received.
SERVER_PROTOCOL: The name and version of the information-retrieval protocol relating to this request, usually HTTP/1.0.
SERVER_SOFTWARE: The name and version of the Web server under which the Internet Server Extension is running.