ARM上的如果你对底层感兴趣

				#
				# $Id: data.pm,v 1.1 1996/12/10 14:41:25 aas Exp $
				#
				# Implements access to data:-URLs as specified in
				# draft-masinter-url-data-02.txt
				
				package LWP::Protocol::data;
				
				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
				    if ($request->method ne 'GET') {
					return new HTTP::Response &HTTP::Status::RC_BAD_REQUEST,
								  'Library does not allow method ' .
								  "$method for 'data:' URLs";
				    }
				
				    my $url = $request->url;
				    my $response = new HTTP::Response &HTTP::Status::RC_OK, "Document follows";
				
				    my($media_type, $params) = $url->media_type;
				    $media_type .= ";$params" if $params;
				
				    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);
				
				    return $response;
				}
				
				1;