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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

RedHat 9.0

(Shrike)

LWP::RobotUA(3pm)
LWP::RobotUA

LWP::RobotUA

NAME
SYNOPSIS
DESCRIPTION
METHODS
SEE ALSO
COPYRIGHT

NAME

LWP::RobotUA − A class for Web Robots

SYNOPSIS 

  require LWP::RobotUA;
  $ua = new LWP::RobotUA ’my-robot/0.1’, ’me@foo.com’;
  $ua->delay(10);  # be very nice, go slowly
  ...
  # just use it just like a normal LWP::UserAgent
  $res = $ua->request($req);

DESCRIPTION

This class implements a user agent that is suitable for robot applications. Robots should be nice to the servers they visit. They should consult the /robots.txt file to ensure that they are welcomed and they should not make requests too frequently.

But, before you consider writing a robot take a look at <URL:http://info.webcrawler.com/mak/projects/robots/robots.html>.

When you use a LWP::RobotUA as your user agent, then you do not really have to think about these things yourself. Just send requests as you do when you are using a normal LWP::UserAgent and this special agent will make sure you are nice.

METHODS

The LWP::RobotUA is a sub-class of LWP::UserAgent and implements the same methods. In addition the following methods are provided:
$ua = LWP::RobotUA−>new($agent_name, $from, [$rules])

Your robot’s name and the mail address of the human responsible for the robot (i.e. you) are required by the constructor.

Optionally it allows you to specify the WWW::RobotRules object to use.

$ua−>delay([$minutes])

Set the minimum delay between requests to the same server. The default is 1 minute.

$ua−>use_sleep([$boolean])

Get/set a value indicating whether the UA should sleep() if requests arrive too fast (before $ua−>delay minutes has passed). The default is TRUE . If this value is FALSE then an internal SERVICE_UNAVAILABLE response will be generated. It will have an Retry-After header that indicates when it is OK to send another request to this server.

$ua−>rules([$rules])

Set/get which WWW::RobotRules object to use.

$ua−>no_visits($netloc)

Returns the number of documents fetched from this server host. Yes I know, this method should probably have been named num_visits() or something like that. :−(

$ua−>host_wait($netloc)

Returns the number of seconds (from now) you must wait before you can make a new request to this host.

$ua−>as_string

Returns a string that describes the state of the UA . Mainly useful for debugging.

SEE ALSO

LWP::UserAgent, WWW::RobotRules

COPYRIGHT

Copyright 1996−2000 Gisle Aas.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

LWP::RobotUA(3pm)