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Perl HTTP Services


Perl CGI

Decoding HTML requests: 

	($command, $request, $method) = split(" ",$command);
	($document, $request) = split("\\\?",$request);
	for (split("&",$request) ) {
		s/\+/ /g;
		($key, $val) = split("=",$_); 
		$key =~ s/%(..)/pack("c",hex($1))/ge;
		$val =~ s/%(..)/pack("c",hex($1))/ge;
		$query{$key} = $val;

sub escapeHTML {
         my ($self,$toencode,$newlinestoo) = CGI::self_or_default(@_);
         return undef unless defined($toencode);
         return $toencode if ref($self) && $self->{'dontescape'};
         $toencode =~ s{&}{&}gso;
         $toencode =~ s{<}{&lt;}gso;
         $toencode =~ s{>}{&gt;}gso;
         $toencode =~ s{"}{&quot;}gso;
         my $latin = uc $self->{'.charset'} eq 'ISO-8859-1' ||
                     uc $self->{'.charset'} eq 'WINDOWS-1252';
         if ($latin) {  # bug in some browsers
                $toencode =~ s{'}{&#39;}gso;
                $toencode =~ s{\x8b}{&#139;}gso;
                $toencode =~ s{\x9b}{&#155;}gso;
                if (defined $newlinestoo && $newlinestoo) {
                     $toencode =~ s{\012}{&#10;}gso;
                     $toencode =~ s{\015}{&#13;}gso;
                }
         }
         return $toencode;
}

sub unescapeHTML {
    my ($self,$string) = CGI::self_or_default(@_);
    return undef unless defined($string);
    my $latin = defined $self->{'.charset'} ? $self->{'.charset'} =~ /^(ISO-8859-1|WINDOWS-1252)$/i
                                            : 1;
    # thanks to Randal Schwartz for the correct solution to this one
    $string=~ s[&(.*?);]{
	local $_ = $1;
	/^amp$/i	? "&" :
	/^quot$/i	? '"' :
        /^gt$/i		? ">" :
	/^lt$/i		? "<" :
	/^#(\d+)$/ && $latin	     ? chr($1) :
	/^#x([0-9a-f]+)$/i && $latin ? chr(hex($1)) :
	$_
	}gex;
    return $string;
}

Encodeing CGI Environment Variables for handoff to a CGI program 

$ENV{SERVER_SOFTWARE} = 'MyHTTPd/0.1';
$ENV{SERVER_NAME} = Sys::Hostname::hostname();
$ENV{GATEWAY_INTERFACE} = 'CGI/1.1';
$ENV{SERVER_PROTOCOL} = $protocol;
$ENV{SERVER_PORT} = $PORT;
$ENV{REQUEST_METHOD} = $method;
$ENV{QUERY_STRING} = $querydata;
$ENV{REMOTE_ADDR} = $client->peerhost;
$ENV{HTTP_ACCEPT} = $request{'Accept'};
$ENV{HTTP_USER_AGENT} = $request{'User_Agent'};
$ENV{SCRIPT_NAME} = $request->url->epath;
$ENV{CONTENT_LENGTH} = 0;

See also

file: /techref/language/perl/www.htm, 3KB, , updated: 2001/6/21 12:55, local time: 2009/11/22 08:29,
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SX MASTERS: Eric Smith and Richard Ottosen's SERVID is an intellegent RS232 video terminal (4x20 character display) in one SX chip. See the write up.
 

Robotics nuts!

Check out http://www.verinet.com/~dlc/ email: dlc@verinet.com... This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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