JSP中获取一些服务器变量

JSP中获取相应的服务器变量（包括HTTP头中的变量）的方法：
SERVER_NAME        request.getServerName();
SERVER_SOFTWARE    request.getServletContext().getServerInfo();
SERVER_PROTOCOL    request.getProtocol();
SERVER_PORT        request.getServerPort()
REQUEST_METHOD    request.getMethod()
PATH_INFO          request.getPathInfo()
PATH_TRANSLATED    request.getPathTranslated()
SCRIPT_NAME        request.getServletPath()
DOCUMENT_ROOT      request.getRealPath("/")
QUERY_STRING      request.getQueryString()
REMOTE_HOST        request.getRemoteHost()
REMOTE_ADDR        request.getRemoteAddr()
AUTH_TYPE          request.getAuthType()
REMOTE_USER        request.getRemoteUser()
CONTENT_TYPE      request.getContentType()
CONTENT_LENGTH    request.getContentLength()
HTTP_ACCEPT        request.getHeader("Accept")
HTTP_USER_AGENT    request.getHeader("User-Agent")
HTTP_REFERER      request.getHeader("Referer")