Core Servlets and JavaServer Pages™

A.5. Accessing the Standard CGI Variables

You should usually think in terms of request info, response info, and server info, not CGI variables.

Capabilities Not Discussed Elsewhere

• getServletContext().getRealPath("uri"): maps URI to real path

• request.getRemoteHost(): name of host making request

• request.getRemoteAddress(): IP address of host making request

Servlet Equivalent of CGI Variables

• AUTH_TYPE: request.getAuthType()

• CONTENT_LENGTH: request.getContentLength()

• CONTENT_TYPE: request.getContentType()

• DOCUMENT_ROOT: getServletContext().getRealPath("/")

• HTTP_XXX_YYY: request.getHeader("Xxx-Yyy")

• PATH_INFO: request.getPathInfo()

• PATH_TRANSLATED: request.getPathTranslated()

• QUERY_STRING: request.getQueryString()

• REMOTE_ADDR: request.getRemoteAddr()

• REMOTE_HOST: ...