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LinkChecker 5.0 (Stable branch)
01-25-2009
With LinkChecker, you can check HTML documents and Web sites for broken links. It features recursion, robots.txt exclusion protocol support, HTTP proxy support, i18n support, multithreading, regular expression filtering rules for links, and user/password checking for authorized pages. Output can be colored or normal text, HTML, SQL, CSV, or a sitemap graph in DOT, GML, or XML format. Supported link types are HTTP/1.1 and 1.0, HTTPS, FTP, mailto:, news:, nntp:, Telnet, and local files. License: GNU General Public License (GPL) Changes:|
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WWW::RobotRules(3) User Contributed Perl Documentation WWW::RobotRules(3) NAME
WWW::RobotsRules - Parse robots.txt files SYNOPSIS
require WWW::RobotRules; my $robotsrules = new WWW::RobotRules 'MOMspider/1.0'; use LWP::Simple qw(get); $url = "http://some.place/robots.txt"; my $robots_txt = get $url; $robotsrules->parse($url, $robots_txt); $url = "http://some.other.place/robots.txt"; my $robots_txt = get $url; $robotsrules->parse($url, $robots_txt); # Now we are able to check if a URL is valid for those servers that # we have obtained and parsed "robots.txt" files for. if($robotsrules->allowed($url)) { $c = get $url; ... } DESCRIPTION
This module parses a /robots.txt file as specified in "A Standard for Robot Exclusion", described in <http://info.webcrawler.com/mak/projects/robots/norobots.html> Webmasters can use the /robots.txt file to disallow conforming robots access to parts of their web site. The parsed file is kept in the WWW::RobotRules object, and this object provides methods to check if access to a given URL is prohibited. The same WWW::RobotRules object can parse multiple /robots.txt files. The following methods are provided: $rules = WWW::RobotRules->new($robot_name) This is the constructor for WWW::RobotRules objects. The first argument given to new() is the name of the robot. $rules->parse($robot_txt_url, $content, $fresh_until) The parse() method takes as arguments the URL that was used to retrieve the /robots.txt file, and the contents of the file. $rules->allowed($uri) Returns TRUE if this robot is allowed to retrieve this URL. $rules->agent([$name]) Get/set the agent name. NOTE: Changing the agent name will clear the robots.txt rules and expire times out of the cache. ROBOTS.TXT The format and semantics of the "/robots.txt" file are as follows (this is an edited abstract of <http://info.webcrawler.com/mak/projects/robots/norobots.html>): The file consists of one or more records separated by one or more blank lines. Each record contains lines of the form <field-name>: <value> The field name is case insensitive. Text after the '#' character on a line is ignored during parsing. This is used for comments. The following <field-names> can be used: User-Agent The value of this field is the name of the robot the record is describing access policy for. If more than one User-Agent field is present the record describes an identical access policy for more than one robot. At least one field needs to be present per record. If the value is '*', the record describes the default access policy for any robot that has not not matched any of the other records. Disallow The value of this field specifies a partial URL that is not to be visited. This can be a full path, or a partial path; any URL that starts with this value will not be retrieved ROBOTS.TXT EXAMPLES The following example "/robots.txt" file specifies that no robots should visit any URL starting with "/cyberworld/map/" or "/tmp/": User-agent: * Disallow: /cyberworld/map/ # This is an infinite virtual URL space Disallow: /tmp/ # these will soon disappear This example "/robots.txt" file specifies that no robots should visit any URL starting with "/cyberworld/map/", except the robot called "cybermapper": User-agent: * Disallow: /cyberworld/map/ # This is an infinite virtual URL space # Cybermapper knows where to go. User-agent: cybermapper Disallow: This example indicates that no robots should visit this site further: # go away User-agent: * Disallow: / SEE ALSO
LWP::RobotUA, WWW::RobotRules::AnyDBM_File libwww-perl-5.65 2001-04-20 WWW::RobotRules(3)