The SSI servlet currently implements the following variables:
| Variable Name | Description |
| AUTH_TYPE | The type of authentication used for this user: BASIC, FORM, etc. |
| CONTENT_LENGTH | The length of the data (in bytes or the number of characters) passed from a form. |
| CONTENT_TYPE | The MIME type of the query data, such as “text/html”. |
| 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_URI | Virtual path to the file |
| GATEWAY_INTERFACE | The revision of the Common Gateway Interface that the server uses if enabled: “CGI/1.1”. |
| HTTP_ACCEPT | A list of the MIME types that the client can accept. |
| HTTP_ACCEPT_ENCODING | A list of the compression types that the client can accept. |
| HTTP_ACCEPT_LANGUAGE | A list of the languages that the client can accept. |
| HTTP_CONNECTION | The way that the connection from the client is being managed: “Close” or “Keep-Alive”. |
| HTTP_HOST | The web site that the client requested. |
| HTTP_REFERER | The URL of the document that the client linked from. |
| HTTP_USER_AGENT | The browser the client is using to issue the request. |
| LAST_MODIFIED | Last modification date and time for current file |
| PATH_INFO | Extra path information passed to a servlet. |
| PATH_TRANSLATED | The translated version of the path given by the variable PATH_INFO. |
| QUERY_STRING | The query string that follows the “?” in the URL. |
| QUERY_STRING_UNESCAPED | Undecoded query string with all shell metacharacters escaped with “\” |
| REMOTE_ADDR | The remote IP address of the user making the request. |
| REMOTE_HOST | The remote hostname of the user making the request. |
| REMOTE_PORT | The port number at remote IP address of the user making the request. |
| REMOTE_USER | The authenticated name of the user. |
| REQUEST_METHOD | The method with which the information request was issued: “GET”, “POST” etc. |
| REQUEST_URI | The web page originally requested by the client. |
| SCRIPT_FILENAME | The location of the current web page on the server. |
| SCRIPT_NAME | The name of the web page. |
| SERVER_ADDR | The server’s IP address. |
| SERVER_NAME | The server’s hostname or IP address. |
| SERVER_PORT | The port on which the server received the request. |
| SERVER_PROTOCOL | The protocol used by the server. E.g. “HTTP/1.1”. |
| SERVER_SOFTWARE | The name and version of the server software that is answering the client request. |
| UNIQUE_ID | A token used to identify the current session if one has been established. |
