1. 记录每个帖子的访问人情况

				#				# $Id: data.pm,v 1.2 1998/11/19 21:45:01 aas Exp $				#				# Implements access to data:-URLs as specified in RFC 2397												package LWP::Protocol::data;				use strict;				use vars qw(@ISA);								require HTTP::Response;				require HTTP::Status;								require LWP::Protocol;				@ISA = qw(LWP::Protocol);								use HTTP::Date qw(time2str);				require LWP;  # needs version number								sub request				{				    my($self, $request, $proxy, $arg, $size) = @_;								    # check proxy				    if (defined $proxy)				    {					return new HTTP::Response &HTTP::Status::RC_BAD_REQUEST,								  'You can not proxy with data';				    }								    # check method				    my $method = $request->method;				    unless ($method eq 'GET' || $method eq 'HEAD') {					return new HTTP::Response &HTTP::Status::RC_BAD_REQUEST,								  'Library does not allow method ' .								  "$method for 'data:' URLs";				    }								    my $url = $request->url;				    my $response = new HTTP::Response &HTTP::Status::RC_OK, "Document follows";								    my $media_type = $url->media_type;								    my $data = $url->data;				    $response->header('Content-Type'   => $media_type,						      'Content-Length' => length($data),						      'Date'           => time2str(time),						      'Server'         => "libwww-perl-internal/$LWP::VERSION"						     );				    $response->content($data) if $method ne "HEAD";								    return $response;				}								1;