List of Most Commonly Used CGI Equivalents of Servlets

 
AUTH_TYPE        request.getAuthType()
CONTENT_LENGTH   request.getContentLength()
CONTENT_TYPE     request.getContentType()
DOCUMENT_ROOT    getServletContext().getRealPath()
PATH_INFO        request.getPathInfo()
PATH_TRANSLATED  request.getPathTranslated()
QUERY_STRING     request.getQueryString()
REMOTE_ADDR      request.getRemoteAddr()
REMOTE_HOST      request.getRemoteHost()
REMOTE_USER      request.getRemoteUser()
REQUEST_METHOD   request.getMethod()
SCRIPT_NAME      request.getServletPath()
SERVER_NAME      request.getServerName()
SERVER_PORT      request.getServerPort()
SERVER_PROTOCOL  request.getProtocol()
SERVER_SOFTWARE  getServletContext().getServerInfo()

 
HTTP_REFERER    by request.getHeader("Referer")
HTTP_COOKIE     by request.getHeader("Cookie")
HTTP_USER_AGENT by request.getHeader("User-Agent")