diff options
author | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 12:20:49 +0000 |
---|---|---|
committer | Siep Kroonenberg <siepo@cybercomm.nl> | 2011-02-17 12:20:49 +0000 |
commit | 316ee97c621496b0fe3267f57cce81bee44ca1e6 (patch) | |
tree | cb2cab1192b4f58a7971af19b213e980bceda4b4 /Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm | |
parent | cd0f87b5d39480d85ad9bd4ee37f520f75bed560 (diff) |
Moving old tlperl prior to committing new one
git-svn-id: svn://tug.org/texlive/trunk@21422 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm')
-rwxr-xr-x | Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm | 1700 |
1 files changed, 1700 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm b/Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm new file mode 100755 index 00000000000..abec3f68762 --- /dev/null +++ b/Master/tlpkg/tlperl0/lib/LWP/UserAgent.pm @@ -0,0 +1,1700 @@ +package LWP::UserAgent; + +use strict; +use vars qw(@ISA $VERSION); + +require LWP::MemberMixin; +@ISA = qw(LWP::MemberMixin); +$VERSION = "5.834"; + +use HTTP::Request (); +use HTTP::Response (); +use HTTP::Date (); + +use LWP (); +use LWP::Protocol (); + +use Carp (); + +if ($ENV{PERL_LWP_USE_HTTP_10}) { + require LWP::Protocol::http10; + LWP::Protocol::implementor('http', 'LWP::Protocol::http10'); + eval { + require LWP::Protocol::https10; + LWP::Protocol::implementor('https', 'LWP::Protocol::https10'); + }; +} + + + +sub new +{ + # Check for common user mistake + Carp::croak("Options to LWP::UserAgent should be key/value pairs, not hash reference") + if ref($_[1]) eq 'HASH'; + + my($class, %cnf) = @_; + + my $agent = delete $cnf{agent}; + my $from = delete $cnf{from}; + my $def_headers = delete $cnf{default_headers}; + my $timeout = delete $cnf{timeout}; + $timeout = 3*60 unless defined $timeout; + my $local_address = delete $cnf{local_address}; + my $use_eval = delete $cnf{use_eval}; + $use_eval = 1 unless defined $use_eval; + my $parse_head = delete $cnf{parse_head}; + $parse_head = 1 unless defined $parse_head; + my $show_progress = delete $cnf{show_progress}; + my $max_size = delete $cnf{max_size}; + my $max_redirect = delete $cnf{max_redirect}; + $max_redirect = 7 unless defined $max_redirect; + my $env_proxy = delete $cnf{env_proxy}; + + my $cookie_jar = delete $cnf{cookie_jar}; + my $conn_cache = delete $cnf{conn_cache}; + my $keep_alive = delete $cnf{keep_alive}; + + Carp::croak("Can't mix conn_cache and keep_alive") + if $conn_cache && $keep_alive; + + + my $protocols_allowed = delete $cnf{protocols_allowed}; + my $protocols_forbidden = delete $cnf{protocols_forbidden}; + + my $requests_redirectable = delete $cnf{requests_redirectable}; + $requests_redirectable = ['GET', 'HEAD'] + unless defined $requests_redirectable; + + # Actually ""s are just as good as 0's, but for concision we'll just say: + Carp::croak("protocols_allowed has to be an arrayref or 0, not \"$protocols_allowed\"!") + if $protocols_allowed and ref($protocols_allowed) ne 'ARRAY'; + Carp::croak("protocols_forbidden has to be an arrayref or 0, not \"$protocols_forbidden\"!") + if $protocols_forbidden and ref($protocols_forbidden) ne 'ARRAY'; + Carp::croak("requests_redirectable has to be an arrayref or 0, not \"$requests_redirectable\"!") + if $requests_redirectable and ref($requests_redirectable) ne 'ARRAY'; + + + if (%cnf && $^W) { + Carp::carp("Unrecognized LWP::UserAgent options: @{[sort keys %cnf]}"); + } + + my $self = bless { + def_headers => $def_headers, + timeout => $timeout, + local_address => $local_address, + use_eval => $use_eval, + show_progress=> $show_progress, + max_size => $max_size, + max_redirect => $max_redirect, + proxy => {}, + no_proxy => [], + protocols_allowed => $protocols_allowed, + protocols_forbidden => $protocols_forbidden, + requests_redirectable => $requests_redirectable, + }, $class; + + $self->agent(defined($agent) ? $agent : $class->_agent) + if defined($agent) || !$def_headers || !$def_headers->header("User-Agent"); + $self->from($from) if $from; + $self->cookie_jar($cookie_jar) if $cookie_jar; + $self->parse_head($parse_head); + $self->env_proxy if $env_proxy; + + $self->protocols_allowed( $protocols_allowed ) if $protocols_allowed; + $self->protocols_forbidden($protocols_forbidden) if $protocols_forbidden; + + if ($keep_alive) { + $conn_cache ||= { total_capacity => $keep_alive }; + } + $self->conn_cache($conn_cache) if $conn_cache; + + return $self; +} + + +sub send_request +{ + my($self, $request, $arg, $size) = @_; + my($method, $url) = ($request->method, $request->uri); + my $scheme = $url->scheme; + + local($SIG{__DIE__}); # protect against user defined die handlers + + $self->progress("begin", $request); + + my $response = $self->run_handlers("request_send", $request); + + unless ($response) { + my $protocol; + + { + # Honor object-specific restrictions by forcing protocol objects + # into class LWP::Protocol::nogo. + my $x; + if($x = $self->protocols_allowed) { + if (grep lc($_) eq $scheme, @$x) { + } + else { + require LWP::Protocol::nogo; + $protocol = LWP::Protocol::nogo->new; + } + } + elsif ($x = $self->protocols_forbidden) { + if(grep lc($_) eq $scheme, @$x) { + require LWP::Protocol::nogo; + $protocol = LWP::Protocol::nogo->new; + } + } + # else fall thru and create the protocol object normally + } + + # Locate protocol to use + my $proxy = $request->{proxy}; + if ($proxy) { + $scheme = $proxy->scheme; + } + + unless ($protocol) { + $protocol = eval { LWP::Protocol::create($scheme, $self) }; + if ($@) { + $@ =~ s/ at .* line \d+.*//s; # remove file/line number + $response = _new_response($request, &HTTP::Status::RC_NOT_IMPLEMENTED, $@); + if ($scheme eq "https") { + $response->message($response->message . " (Crypt::SSLeay or IO::Socket::SSL not installed)"); + $response->content_type("text/plain"); + $response->content(<<EOT); +LWP will support https URLs if either Crypt::SSLeay or IO::Socket::SSL +is installed. More information at +<http://search.cpan.org/dist/libwww-perl/README.SSL>. +EOT + } + } + } + + if (!$response && $self->{use_eval}) { + # we eval, and turn dies into responses below + eval { + $response = $protocol->request($request, $proxy, + $arg, $size, $self->{timeout}); + }; + if ($@) { + $@ =~ s/ at .* line \d+.*//s; # remove file/line number + $response = _new_response($request, + &HTTP::Status::RC_INTERNAL_SERVER_ERROR, + $@); + } + } + elsif (!$response) { + $response = $protocol->request($request, $proxy, + $arg, $size, $self->{timeout}); + # XXX: Should we die unless $response->is_success ??? + } + } + + $response->request($request); # record request for reference + $response->header("Client-Date" => HTTP::Date::time2str(time)); + + $self->run_handlers("response_done", $response); + + $self->progress("end", $response); + return $response; +} + + +sub prepare_request +{ + my($self, $request) = @_; + die "Method missing" unless $request->method; + my $url = $request->uri; + die "URL missing" unless $url; + die "URL must be absolute" unless $url->scheme; + + $self->run_handlers("request_preprepare", $request); + + if (my $def_headers = $self->{def_headers}) { + for my $h ($def_headers->header_field_names) { + $request->init_header($h => [$def_headers->header($h)]); + } + } + + $self->run_handlers("request_prepare", $request); + + return $request; +} + + +sub simple_request +{ + my($self, $request, $arg, $size) = @_; + + # sanity check the request passed in + if (defined $request) { + if (ref $request) { + Carp::croak("You need a request object, not a " . ref($request) . " object") + if ref($request) eq 'ARRAY' or ref($request) eq 'HASH' or + !$request->can('method') or !$request->can('uri'); + } + else { + Carp::croak("You need a request object, not '$request'"); + } + } + else { + Carp::croak("No request object passed in"); + } + + eval { + $request = $self->prepare_request($request); + }; + if ($@) { + $@ =~ s/ at .* line \d+.*//s; # remove file/line number + return _new_response($request, &HTTP::Status::RC_BAD_REQUEST, $@); + } + return $self->send_request($request, $arg, $size); +} + + +sub request +{ + my($self, $request, $arg, $size, $previous) = @_; + + my $response = $self->simple_request($request, $arg, $size); + $response->previous($previous) if $previous; + + if ($response->redirects >= $self->{max_redirect}) { + $response->header("Client-Warning" => + "Redirect loop detected (max_redirect = $self->{max_redirect})"); + return $response; + } + + if (my $req = $self->run_handlers("response_redirect", $response)) { + return $self->request($req, $arg, $size, $response); + } + + my $code = $response->code; + + if ($code == &HTTP::Status::RC_MOVED_PERMANENTLY or + $code == &HTTP::Status::RC_FOUND or + $code == &HTTP::Status::RC_SEE_OTHER or + $code == &HTTP::Status::RC_TEMPORARY_REDIRECT) + { + my $referral = $request->clone; + + # These headers should never be forwarded + $referral->remove_header('Host', 'Cookie'); + + if ($referral->header('Referer') && + $request->uri->scheme eq 'https' && + $referral->uri->scheme eq 'http') + { + # RFC 2616, section 15.1.3. + # https -> http redirect, suppressing Referer + $referral->remove_header('Referer'); + } + + if ($code == &HTTP::Status::RC_SEE_OTHER || + $code == &HTTP::Status::RC_FOUND) + { + my $method = uc($referral->method); + unless ($method eq "GET" || $method eq "HEAD") { + $referral->method("GET"); + $referral->content(""); + $referral->remove_content_headers; + } + } + + # And then we update the URL based on the Location:-header. + my $referral_uri = $response->header('Location'); + { + # Some servers erroneously return a relative URL for redirects, + # so make it absolute if it not already is. + local $URI::ABS_ALLOW_RELATIVE_SCHEME = 1; + my $base = $response->base; + $referral_uri = "" unless defined $referral_uri; + $referral_uri = $HTTP::URI_CLASS->new($referral_uri, $base) + ->abs($base); + } + $referral->uri($referral_uri); + + return $response unless $self->redirect_ok($referral, $response); + return $self->request($referral, $arg, $size, $response); + + } + elsif ($code == &HTTP::Status::RC_UNAUTHORIZED || + $code == &HTTP::Status::RC_PROXY_AUTHENTICATION_REQUIRED + ) + { + my $proxy = ($code == &HTTP::Status::RC_PROXY_AUTHENTICATION_REQUIRED); + my $ch_header = $proxy ? "Proxy-Authenticate" : "WWW-Authenticate"; + my @challenge = $response->header($ch_header); + unless (@challenge) { + $response->header("Client-Warning" => + "Missing Authenticate header"); + return $response; + } + + require HTTP::Headers::Util; + CHALLENGE: for my $challenge (@challenge) { + $challenge =~ tr/,/;/; # "," is used to separate auth-params!! + ($challenge) = HTTP::Headers::Util::split_header_words($challenge); + my $scheme = shift(@$challenge); + shift(@$challenge); # no value + $challenge = { @$challenge }; # make rest into a hash + + unless ($scheme =~ /^([a-z]+(?:-[a-z]+)*)$/) { + $response->header("Client-Warning" => + "Bad authentication scheme '$scheme'"); + return $response; + } + $scheme = $1; # untainted now + my $class = "LWP::Authen::\u$scheme"; + $class =~ s/-/_/g; + + no strict 'refs'; + unless (%{"$class\::"}) { + # try to load it + eval "require $class"; + if ($@) { + if ($@ =~ /^Can\'t locate/) { + $response->header("Client-Warning" => + "Unsupported authentication scheme '$scheme'"); + } + else { + $response->header("Client-Warning" => $@); + } + next CHALLENGE; + } + } + unless ($class->can("authenticate")) { + $response->header("Client-Warning" => + "Unsupported authentication scheme '$scheme'"); + next CHALLENGE; + } + return $class->authenticate($self, $proxy, $challenge, $response, + $request, $arg, $size); + } + return $response; + } + return $response; +} + + +# +# Now the shortcuts... +# +sub get { + require HTTP::Request::Common; + my($self, @parameters) = @_; + my @suff = $self->_process_colonic_headers(\@parameters,1); + return $self->request( HTTP::Request::Common::GET( @parameters ), @suff ); +} + + +sub post { + require HTTP::Request::Common; + my($self, @parameters) = @_; + my @suff = $self->_process_colonic_headers(\@parameters, (ref($parameters[1]) ? 2 : 1)); + return $self->request( HTTP::Request::Common::POST( @parameters ), @suff ); +} + + +sub head { + require HTTP::Request::Common; + my($self, @parameters) = @_; + my @suff = $self->_process_colonic_headers(\@parameters,1); + return $self->request( HTTP::Request::Common::HEAD( @parameters ), @suff ); +} + + +sub _process_colonic_headers { + # Process :content_cb / :content_file / :read_size_hint headers. + my($self, $args, $start_index) = @_; + + my($arg, $size); + for(my $i = $start_index; $i < @$args; $i += 2) { + next unless defined $args->[$i]; + + #printf "Considering %s => %s\n", $args->[$i], $args->[$i + 1]; + + if($args->[$i] eq ':content_cb') { + # Some sanity-checking... + $arg = $args->[$i + 1]; + Carp::croak("A :content_cb value can't be undef") unless defined $arg; + Carp::croak("A :content_cb value must be a coderef") + unless ref $arg and UNIVERSAL::isa($arg, 'CODE'); + + } + elsif ($args->[$i] eq ':content_file') { + $arg = $args->[$i + 1]; + + # Some sanity-checking... + Carp::croak("A :content_file value can't be undef") + unless defined $arg; + Carp::croak("A :content_file value can't be a reference") + if ref $arg; + Carp::croak("A :content_file value can't be \"\"") + unless length $arg; + + } + elsif ($args->[$i] eq ':read_size_hint') { + $size = $args->[$i + 1]; + # Bother checking it? + + } + else { + next; + } + splice @$args, $i, 2; + $i -= 2; + } + + # And return a suitable suffix-list for request(REQ,...) + + return unless defined $arg; + return $arg, $size if defined $size; + return $arg; +} + +my @ANI = qw(- \ | /); + +sub progress { + my($self, $status, $m) = @_; + return unless $self->{show_progress}; + + local($,, $\); + if ($status eq "begin") { + print STDERR "** ", $m->method, " ", $m->uri, " ==> "; + $self->{progress_start} = time; + $self->{progress_lastp} = ""; + $self->{progress_ani} = 0; + } + elsif ($status eq "end") { + delete $self->{progress_lastp}; + delete $self->{progress_ani}; + print STDERR $m->status_line; + my $t = time - delete $self->{progress_start}; + print STDERR " (${t}s)" if $t; + print STDERR "\n"; + } + elsif ($status eq "tick") { + print STDERR "$ANI[$self->{progress_ani}++]\b"; + $self->{progress_ani} %= @ANI; + } + else { + my $p = sprintf "%3.0f%%", $status * 100; + return if $p eq $self->{progress_lastp}; + print STDERR "$p\b\b\b\b"; + $self->{progress_lastp} = $p; + } + STDERR->flush; +} + + +# +# This whole allow/forbid thing is based on man 1 at's way of doing things. +# +sub is_protocol_supported +{ + my($self, $scheme) = @_; + if (ref $scheme) { + # assume we got a reference to an URI object + $scheme = $scheme->scheme; + } + else { + Carp::croak("Illegal scheme '$scheme' passed to is_protocol_supported") + if $scheme =~ /\W/; + $scheme = lc $scheme; + } + + my $x; + if(ref($self) and $x = $self->protocols_allowed) { + return 0 unless grep lc($_) eq $scheme, @$x; + } + elsif (ref($self) and $x = $self->protocols_forbidden) { + return 0 if grep lc($_) eq $scheme, @$x; + } + + local($SIG{__DIE__}); # protect against user defined die handlers + $x = LWP::Protocol::implementor($scheme); + return 1 if $x and $x ne 'LWP::Protocol::nogo'; + return 0; +} + + +sub protocols_allowed { shift->_elem('protocols_allowed' , @_) } +sub protocols_forbidden { shift->_elem('protocols_forbidden' , @_) } +sub requests_redirectable { shift->_elem('requests_redirectable', @_) } + + +sub redirect_ok +{ + # RFC 2616, section 10.3.2 and 10.3.3 say: + # If the 30[12] status code is received in response to a request other + # than GET or HEAD, the user agent MUST NOT automatically redirect the + # request unless it can be confirmed by the user, since this might + # change the conditions under which the request was issued. + + # Note that this routine used to be just: + # return 0 if $_[1]->method eq "POST"; return 1; + + my($self, $new_request, $response) = @_; + my $method = $response->request->method; + return 0 unless grep $_ eq $method, + @{ $self->requests_redirectable || [] }; + + if ($new_request->uri->scheme eq 'file') { + $response->header("Client-Warning" => + "Can't redirect to a file:// URL!"); + return 0; + } + + # Otherwise it's apparently okay... + return 1; +} + + +sub credentials +{ + my $self = shift; + my $netloc = lc(shift); + my $realm = shift || ""; + my $old = $self->{basic_authentication}{$netloc}{$realm}; + if (@_) { + $self->{basic_authentication}{$netloc}{$realm} = [@_]; + } + return unless $old; + return @$old if wantarray; + return join(":", @$old); +} + + +sub get_basic_credentials +{ + my($self, $realm, $uri, $proxy) = @_; + return if $proxy; + return $self->credentials($uri->host_port, $realm); +} + + +sub timeout { shift->_elem('timeout', @_); } +sub local_address{ shift->_elem('local_address',@_); } +sub max_size { shift->_elem('max_size', @_); } +sub max_redirect { shift->_elem('max_redirect', @_); } +sub show_progress{ shift->_elem('show_progress', @_); } + +sub parse_head { + my $self = shift; + if (@_) { + my $flag = shift; + my $parser; + my $old = $self->set_my_handler("response_header", $flag ? sub { + my($response, $ua) = @_; + require HTML::HeadParser; + $parser = HTML::HeadParser->new; + $parser->xml_mode(1) if $response->content_is_xhtml; + $parser->utf8_mode(1) if $] >= 5.008 && $HTML::Parser::VERSION >= 3.40; + + push(@{$response->{handlers}{response_data}}, { + callback => sub { + return unless $parser; + unless ($parser->parse($_[3])) { + my $h = $parser->header; + my $r = $_[0]; + for my $f ($h->header_field_names) { + $r->init_header($f, [$h->header($f)]); + } + undef($parser); + } + }, + }); + + } : undef, + m_media_type => "html", + ); + return !!$old; + } + else { + return !!$self->get_my_handler("response_header"); + } +} + +sub cookie_jar { + my $self = shift; + my $old = $self->{cookie_jar}; + if (@_) { + my $jar = shift; + if (ref($jar) eq "HASH") { + require HTTP::Cookies; + $jar = HTTP::Cookies->new(%$jar); + } + $self->{cookie_jar} = $jar; + $self->set_my_handler("request_prepare", + $jar ? sub { $jar->add_cookie_header($_[0]); } : undef, + ); + $self->set_my_handler("response_done", + $jar ? sub { $jar->extract_cookies($_[0]); } : undef, + ); + } + $old; +} + +sub default_headers { + my $self = shift; + my $old = $self->{def_headers} ||= HTTP::Headers->new; + if (@_) { + Carp::croak("default_headers not set to HTTP::Headers compatible object") + unless @_ == 1 && $_[0]->can("header_field_names"); + $self->{def_headers} = shift; + } + return $old; +} + +sub default_header { + my $self = shift; + return $self->default_headers->header(@_); +} + +sub _agent { "libwww-perl/$LWP::VERSION" } + +sub agent { + my $self = shift; + if (@_) { + my $agent = shift; + if ($agent) { + $agent .= $self->_agent if $agent =~ /\s+$/; + } + else { + undef($agent) + } + return $self->default_header("User-Agent", $agent); + } + return $self->default_header("User-Agent"); +} + +sub from { # legacy + my $self = shift; + return $self->default_header("From", @_); +} + + +sub conn_cache { + my $self = shift; + my $old = $self->{conn_cache}; + if (@_) { + my $cache = shift; + if (ref($cache) eq "HASH") { + require LWP::ConnCache; + $cache = LWP::ConnCache->new(%$cache); + } + $self->{conn_cache} = $cache; + } + $old; +} + + +sub add_handler { + my($self, $phase, $cb, %spec) = @_; + $spec{line} ||= join(":", (caller)[1,2]); + my $conf = $self->{handlers}{$phase} ||= do { + require HTTP::Config; + HTTP::Config->new; + }; + $conf->add(%spec, callback => $cb); +} + +sub set_my_handler { + my($self, $phase, $cb, %spec) = @_; + $spec{owner} = (caller(1))[3] unless exists $spec{owner}; + $self->remove_handler($phase, %spec); + $spec{line} ||= join(":", (caller)[1,2]); + $self->add_handler($phase, $cb, %spec) if $cb; +} + +sub get_my_handler { + my $self = shift; + my $phase = shift; + my $init = pop if @_ % 2; + my %spec = @_; + my $conf = $self->{handlers}{$phase}; + unless ($conf) { + return unless $init; + require HTTP::Config; + $conf = $self->{handlers}{$phase} = HTTP::Config->new; + } + $spec{owner} = (caller(1))[3] unless exists $spec{owner}; + my @h = $conf->find(%spec); + if (!@h && $init) { + if (ref($init) eq "CODE") { + $init->(\%spec); + } + elsif (ref($init) eq "HASH") { + while (my($k, $v) = each %$init) { + $spec{$k} = $v; + } + } + $spec{callback} ||= sub {}; + $spec{line} ||= join(":", (caller)[1,2]); + $conf->add(\%spec); + return \%spec; + } + return wantarray ? @h : $h[0]; +} + +sub remove_handler { + my($self, $phase, %spec) = @_; + if ($phase) { + my $conf = $self->{handlers}{$phase} || return; + my @h = $conf->remove(%spec); + delete $self->{handlers}{$phase} if $conf->empty; + return @h; + } + + return unless $self->{handlers}; + return map $self->remove_handler($_), sort keys %{$self->{handlers}}; +} + +sub handlers { + my($self, $phase, $o) = @_; + my @h; + if ($o->{handlers} && $o->{handlers}{$phase}) { + push(@h, @{$o->{handlers}{$phase}}); + } + if (my $conf = $self->{handlers}{$phase}) { + push(@h, $conf->matching($o)); + } + return @h; +} + +sub run_handlers { + my($self, $phase, $o) = @_; + if (defined(wantarray)) { + for my $h ($self->handlers($phase, $o)) { + my $ret = $h->{callback}->($o, $self, $h); + return $ret if $ret; + } + return undef; + } + + for my $h ($self->handlers($phase, $o)) { + $h->{callback}->($o, $self, $h); + } +} + + +# depreciated +sub use_eval { shift->_elem('use_eval', @_); } +sub use_alarm +{ + Carp::carp("LWP::UserAgent->use_alarm(BOOL) is a no-op") + if @_ > 1 && $^W; + ""; +} + + +sub clone +{ + my $self = shift; + my $copy = bless { %$self }, ref $self; # copy most fields + + delete $copy->{handlers}; + delete $copy->{conn_cache}; + + # copy any plain arrays and hashes; known not to need recursive copy + for my $k (qw(proxy no_proxy requests_redirectable)) { + next unless $copy->{$k}; + if (ref($copy->{$k}) eq "ARRAY") { + $copy->{$k} = [ @{$copy->{$k}} ]; + } + elsif (ref($copy->{$k}) eq "HASH") { + $copy->{$k} = { %{$copy->{$k}} }; + } + } + + if ($self->{def_headers}) { + $copy->{def_headers} = $self->{def_headers}->clone; + } + + # re-enable standard handlers + $copy->parse_head($self->parse_head); + + # no easy way to clone the cookie jar; so let's just remove it for now + $copy->cookie_jar(undef); + + $copy; +} + + +sub mirror +{ + my($self, $url, $file) = @_; + + my $request = HTTP::Request->new('GET', $url); + + # If the file exists, add a cache-related header + if ( -e $file ) { + my ($mtime) = ( stat($file) )[9]; + if ($mtime) { + $request->header( 'If-Modified-Since' => HTTP::Date::time2str($mtime) ); + } + } + my $tmpfile = "$file-$$"; + + my $response = $self->request($request, $tmpfile); + if ( $response->header('X-Died') ) { + die $response->header('X-Died'); + } + + # Only fetching a fresh copy of the would be considered success. + # If the file was not modified, "304" would returned, which + # is considered by HTTP::Status to be a "redirect", /not/ "success" + if ( $response->is_success ) { + my @stat = stat($tmpfile) or die "Could not stat tmpfile '$tmpfile': $!"; + my $file_length = $stat[7]; + my ($content_length) = $response->header('Content-length'); + + if ( defined $content_length and $file_length < $content_length ) { + unlink($tmpfile); + die "Transfer truncated: " . "only $file_length out of $content_length bytes received\n"; + } + elsif ( defined $content_length and $file_length > $content_length ) { + unlink($tmpfile); + die "Content-length mismatch: " . "expected $content_length bytes, got $file_length\n"; + } + # The file was the expected length. + else { + # Replace the stale file with a fresh copy + if ( -e $file ) { + # Some dosish systems fail to rename if the target exists + chmod 0777, $file; + unlink $file; + } + rename( $tmpfile, $file ) + or die "Cannot rename '$tmpfile' to '$file': $!\n"; + + # make sure the file has the same last modification time + if ( my $lm = $response->last_modified ) { + utime $lm, $lm, $file; + } + } + } + # The local copy is fresh enough, so just delete the temp file + else { + unlink($tmpfile); + } + return $response; +} + + +sub _need_proxy { + my($req, $ua) = @_; + return if exists $req->{proxy}; + my $proxy = $ua->{proxy}{$req->uri->scheme} || return; + if ($ua->{no_proxy}) { + if (my $host = eval { $req->uri->host }) { + for my $domain (@{$ua->{no_proxy}}) { + if ($host =~ /\Q$domain\E$/) { + return; + } + } + } + } + $req->{proxy} = $HTTP::URI_CLASS->new($proxy); +} + + +sub proxy +{ + my $self = shift; + my $key = shift; + return map $self->proxy($_, @_), @$key if ref $key; + + Carp::croak("'$key' is not a valid URI scheme") unless $key =~ /^$URI::scheme_re\z/; + my $old = $self->{'proxy'}{$key}; + if (@_) { + my $url = shift; + if (defined($url) && length($url)) { + Carp::croak("Proxy must be specified as absolute URI; '$url' is not") unless $url =~ /^$URI::scheme_re:/; + Carp::croak("Bad http proxy specification '$url'") if $url =~ /^https?:/ && $url !~ m,^https?://\w,; + } + $self->{proxy}{$key} = $url; + $self->set_my_handler("request_preprepare", \&_need_proxy) + } + return $old; +} + + +sub env_proxy { + my ($self) = @_; + my($k,$v); + while(($k, $v) = each %ENV) { + if ($ENV{REQUEST_METHOD}) { + # Need to be careful when called in the CGI environment, as + # the HTTP_PROXY variable is under control of that other guy. + next if $k =~ /^HTTP_/; + $k = "HTTP_PROXY" if $k eq "CGI_HTTP_PROXY"; + } + $k = lc($k); + next unless $k =~ /^(.*)_proxy$/; + $k = $1; + if ($k eq 'no') { + $self->no_proxy(split(/\s*,\s*/, $v)); + } + else { + # Ignore random _proxy variables, allow only valid schemes + next unless $k =~ /^$URI::scheme_re\z/; + # Ignore xxx_proxy variables if xxx isn't a supported protocol + next unless LWP::Protocol::implementor($k); + $self->proxy($k, $v); + } + } +} + + +sub no_proxy { + my($self, @no) = @_; + if (@no) { + push(@{ $self->{'no_proxy'} }, @no); + } + else { + $self->{'no_proxy'} = []; + } +} + + +sub _new_response { + my($request, $code, $message) = @_; + my $response = HTTP::Response->new($code, $message); + $response->request($request); + $response->header("Client-Date" => HTTP::Date::time2str(time)); + $response->header("Client-Warning" => "Internal response"); + $response->header("Content-Type" => "text/plain"); + $response->content("$code $message\n"); + return $response; +} + + +1; + +__END__ + +=head1 NAME + +LWP::UserAgent - Web user agent class + +=head1 SYNOPSIS + + require LWP::UserAgent; + + my $ua = LWP::UserAgent->new; + $ua->timeout(10); + $ua->env_proxy; + + my $response = $ua->get('http://search.cpan.org/'); + + if ($response->is_success) { + print $response->decoded_content; # or whatever + } + else { + die $response->status_line; + } + +=head1 DESCRIPTION + +The C<LWP::UserAgent> is a class implementing a web user agent. +C<LWP::UserAgent> objects can be used to dispatch web requests. + +In normal use the application creates an C<LWP::UserAgent> object, and +then configures it with values for timeouts, proxies, name, etc. It +then creates an instance of C<HTTP::Request> for the request that +needs to be performed. This request is then passed to one of the +request method the UserAgent, which dispatches it using the relevant +protocol, and returns a C<HTTP::Response> object. There are +convenience methods for sending the most common request types: get(), +head() and post(). When using these methods then the creation of the +request object is hidden as shown in the synopsis above. + +The basic approach of the library is to use HTTP style communication +for all protocol schemes. This means that you will construct +C<HTTP::Request> objects and receive C<HTTP::Response> objects even +for non-HTTP resources like I<gopher> and I<ftp>. In order to achieve +even more similarity to HTTP style communications, gopher menus and +file directories are converted to HTML documents. + +=head1 CONSTRUCTOR METHODS + +The following constructor methods are available: + +=over 4 + +=item $ua = LWP::UserAgent->new( %options ) + +This method constructs a new C<LWP::UserAgent> object and returns it. +Key/value pair arguments may be provided to set up the initial state. +The following options correspond to attribute methods described below: + + KEY DEFAULT + ----------- -------------------- + agent "libwww-perl/#.###" + from undef + conn_cache undef + cookie_jar undef + default_headers HTTP::Headers->new + local_address undef + max_size undef + max_redirect 7 + parse_head 1 + protocols_allowed undef + protocols_forbidden undef + requests_redirectable ['GET', 'HEAD'] + timeout 180 + +The following additional options are also accepted: If the +C<env_proxy> option is passed in with a TRUE value, then proxy +settings are read from environment variables (see env_proxy() method +below). If the C<keep_alive> option is passed in, then a +C<LWP::ConnCache> is set up (see conn_cache() method below). The +C<keep_alive> value is passed on as the C<total_capacity> for the +connection cache. + +=item $ua->clone + +Returns a copy of the LWP::UserAgent object. + +=back + +=head1 ATTRIBUTES + +The settings of the configuration attributes modify the behaviour of the +C<LWP::UserAgent> when it dispatches requests. Most of these can also +be initialized by options passed to the constructor method. + +The following attribute methods are provided. The attribute value is +left unchanged if no argument is given. The return value from each +method is the old attribute value. + +=over + +=item $ua->agent + +=item $ua->agent( $product_id ) + +Get/set the product token that is used to identify the user agent on +the network. The agent value is sent as the "User-Agent" header in +the requests. The default is the string returned by the _agent() +method (see below). + +If the $product_id ends with space then the _agent() string is +appended to it. + +The user agent string should be one or more simple product identifiers +with an optional version number separated by the "/" character. +Examples are: + + $ua->agent('Checkbot/0.4 ' . $ua->_agent); + $ua->agent('Checkbot/0.4 '); # same as above + $ua->agent('Mozilla/5.0'); + $ua->agent(""); # don't identify + +=item $ua->_agent + +Returns the default agent identifier. This is a string of the form +"libwww-perl/#.###", where "#.###" is substituted with the version number +of this library. + +=item $ua->from + +=item $ua->from( $email_address ) + +Get/set the e-mail address for the human user who controls +the requesting user agent. The address should be machine-usable, as +defined in RFC 822. The C<from> value is send as the "From" header in +the requests. Example: + + $ua->from('gaas@cpan.org'); + +The default is to not send a "From" header. See the default_headers() +method for the more general interface that allow any header to be defaulted. + +=item $ua->cookie_jar + +=item $ua->cookie_jar( $cookie_jar_obj ) + +Get/set the cookie jar object to use. The only requirement is that +the cookie jar object must implement the extract_cookies($request) and +add_cookie_header($response) methods. These methods will then be +invoked by the user agent as requests are sent and responses are +received. Normally this will be a C<HTTP::Cookies> object or some +subclass. + +The default is to have no cookie_jar, i.e. never automatically add +"Cookie" headers to the requests. + +Shortcut: If a reference to a plain hash is passed in as the +$cookie_jar_object, then it is replaced with an instance of +C<HTTP::Cookies> that is initialized based on the hash. This form also +automatically loads the C<HTTP::Cookies> module. It means that: + + $ua->cookie_jar({ file => "$ENV{HOME}/.cookies.txt" }); + +is really just a shortcut for: + + require HTTP::Cookies; + $ua->cookie_jar(HTTP::Cookies->new(file => "$ENV{HOME}/.cookies.txt")); + +=item $ua->default_headers + +=item $ua->default_headers( $headers_obj ) + +Get/set the headers object that will provide default header values for +any requests sent. By default this will be an empty C<HTTP::Headers> +object. + +=item $ua->default_header( $field ) + +=item $ua->default_header( $field => $value ) + +This is just a short-cut for $ua->default_headers->header( $field => +$value ). Example: + + $ua->default_header('Accept-Encoding' => scalar HTTP::Message::decodable()); + $ua->default_header('Accept-Language' => "no, en"); + +=item $ua->conn_cache + +=item $ua->conn_cache( $cache_obj ) + +Get/set the C<LWP::ConnCache> object to use. See L<LWP::ConnCache> +for details. + +=item $ua->credentials( $netloc, $realm ) + +=item $ua->credentials( $netloc, $realm, $uname, $pass ) + +Get/set the user name and password to be used for a realm. + +The $netloc is a string of the form "<host>:<port>". The username and +password will only be passed to this server. Example: + + $ua->credentials("www.example.com:80", "Some Realm", "foo", "secret"); + +=item $ua->local_address + +=item $ua->local_address( $address ) + +Get/set the local interface to bind to for network connections. The interface +can be specified as a hostname or an IP address. This value is passed as the +C<LocalAddr> argument to L<IO::Socket::INET>. + +=item $ua->max_size + +=item $ua->max_size( $bytes ) + +Get/set the size limit for response content. The default is C<undef>, +which means that there is no limit. If the returned response content +is only partial, because the size limit was exceeded, then a +"Client-Aborted" header will be added to the response. The content +might end up longer than C<max_size> as we abort once appending a +chunk of data makes the length exceed the limit. The "Content-Length" +header, if present, will indicate the length of the full content and +will normally not be the same as C<< length($res->content) >>. + +=item $ua->max_redirect + +=item $ua->max_redirect( $n ) + +This reads or sets the object's limit of how many times it will obey +redirection responses in a given request cycle. + +By default, the value is 7. This means that if you call request() +method and the response is a redirect elsewhere which is in turn a +redirect, and so on seven times, then LWP gives up after that seventh +request. + +=item $ua->parse_head + +=item $ua->parse_head( $boolean ) + +Get/set a value indicating whether we should initialize response +headers from the E<lt>head> section of HTML documents. The default is +TRUE. Do not turn this off, unless you know what you are doing. + +=item $ua->protocols_allowed + +=item $ua->protocols_allowed( \@protocols ) + +This reads (or sets) this user agent's list of protocols that the +request methods will exclusively allow. The protocol names are case +insensitive. + +For example: C<$ua-E<gt>protocols_allowed( [ 'http', 'https'] );> +means that this user agent will I<allow only> those protocols, +and attempts to use this user agent to access URLs with any other +schemes (like "ftp://...") will result in a 500 error. + +To delete the list, call: C<$ua-E<gt>protocols_allowed(undef)> + +By default, an object has neither a C<protocols_allowed> list, nor a +C<protocols_forbidden> list. + +Note that having a C<protocols_allowed> list causes any +C<protocols_forbidden> list to be ignored. + +=item $ua->protocols_forbidden + +=item $ua->protocols_forbidden( \@protocols ) + +This reads (or sets) this user agent's list of protocols that the +request method will I<not> allow. The protocol names are case +insensitive. + +For example: C<$ua-E<gt>protocols_forbidden( [ 'file', 'mailto'] );> +means that this user agent will I<not> allow those protocols, and +attempts to use this user agent to access URLs with those schemes +will result in a 500 error. + +To delete the list, call: C<$ua-E<gt>protocols_forbidden(undef)> + +=item $ua->requests_redirectable + +=item $ua->requests_redirectable( \@requests ) + +This reads or sets the object's list of request names that +C<$ua-E<gt>redirect_ok(...)> will allow redirection for. By +default, this is C<['GET', 'HEAD']>, as per RFC 2616. To +change to include 'POST', consider: + + push @{ $ua->requests_redirectable }, 'POST'; + +=item $ua->show_progress + +=item $ua->show_progress( $boolean ) + +Get/set a value indicating whether a progress bar should be displayed +on on the terminal as requests are processed. The default is FALSE. + +=item $ua->timeout + +=item $ua->timeout( $secs ) + +Get/set the timeout value in seconds. The default timeout() value is +180 seconds, i.e. 3 minutes. + +The requests is aborted if no activity on the connection to the server +is observed for C<timeout> seconds. This means that the time it takes +for the complete transaction and the request() method to actually +return might be longer. + +=back + +=head2 Proxy attributes + +The following methods set up when requests should be passed via a +proxy server. + +=over + +=item $ua->proxy(\@schemes, $proxy_url) + +=item $ua->proxy($scheme, $proxy_url) + +Set/retrieve proxy URL for a scheme: + + $ua->proxy(['http', 'ftp'], 'http://proxy.sn.no:8001/'); + $ua->proxy('gopher', 'http://proxy.sn.no:8001/'); + +The first form specifies that the URL is to be used for proxying of +access methods listed in the list in the first method argument, +i.e. 'http' and 'ftp'. + +The second form shows a shorthand form for specifying +proxy URL for a single access scheme. + +=item $ua->no_proxy( $domain, ... ) + +Do not proxy requests to the given domains. Calling no_proxy without +any domains clears the list of domains. Eg: + + $ua->no_proxy('localhost', 'example.com'); + +=item $ua->env_proxy + +Load proxy settings from *_proxy environment variables. You might +specify proxies like this (sh-syntax): + + gopher_proxy=http://proxy.my.place/ + wais_proxy=http://proxy.my.place/ + no_proxy="localhost,example.com" + export gopher_proxy wais_proxy no_proxy + +csh or tcsh users should use the C<setenv> command to define these +environment variables. + +On systems with case insensitive environment variables there exists a +name clash between the CGI environment variables and the C<HTTP_PROXY> +environment variable normally picked up by env_proxy(). Because of +this C<HTTP_PROXY> is not honored for CGI scripts. The +C<CGI_HTTP_PROXY> environment variable can be used instead. + +=back + +=head2 Handlers + +Handlers are code that injected at various phases during the +processing of requests. The following methods are provided to manage +the active handlers: + +=over + +=item $ua->add_handler( $phase => \&cb, %matchspec ) + +Add handler to be invoked in the given processing phase. For how to +specify %matchspec see L<HTTP::Config/"Matching">. + +The possible values $phase and the corresponding callback signatures are: + +=over + +=item request_preprepare => sub { my($request, $ua, $h) = @_; ... } + +The handler is called before the C<request_prepare> and other standard +initialization of of the request. This can be used to set up headers +and attributes that the C<request_prepare> handler depends on. Proxy +initialization should take place here; but in general don't register +handlers for this phase. + +=item request_prepare => sub { my($request, $ua, $h) = @_; ... } + +The handler is called before the request is sent and can modify the +request any way it see fit. This can for instance be used to add +certain headers to specific requests. + +The method can assign a new request object to $_[0] to replace the +request that is sent fully. + +The return value from the callback is ignored. If an exceptions is +raised it will abort the request and make the request method return a +"400 Bad request" response. + +=item request_send => sub { my($request, $ua, $h) = @_; ... } + +This handler get a chance of handling requests before it's sent to the +protocol handlers. It should return an HTTP::Response object if it +wishes to terminate the processing; otherwise it should return nothing. + +The C<response_header> and C<response_data> handlers will not be +invoked for this response, but the C<response_done> will be. + +=item response_header => sub { my($response, $ua, $h) = @_; ... } + +This handler is called right after the response headers have been +received, but before any content data. The handler might set up +handlers for data and might croak to abort the request. + +The handler might set the $response->{default_add_content} value to +control if any received data should be added to the response object +directly. This will initially be false if the $ua->request() method +was called with a ':content_filename' or ':content_callbak' argument; +otherwise true. + +=item response_data => sub { my($response, $ua, $h, $data) = @_; ... } + +This handlers is called for each chunk of data received for the +response. The handler might croak to abort the request. + +This handler need to return a TRUE value to be called again for +subsequent chunks for the same request. + +=item response_done => sub { my($response, $ua, $h) = @_; ... } + +The handler is called after the response has been fully received, but +before any redirect handling is attempted. The handler can be used to +extract information or modify the response. + +=item response_redirect => sub { my($response, $ua, $h) = @_; ... } + +The handler is called in $ua->request after C<response_done>. If the +handler return an HTTP::Request object we'll start over with processing +this request instead. + +=back + +=item $ua->remove_handler( undef, %matchspec ) + +=item $ua->remove_handler( $phase, %matchspec ) + +Remove handlers that match the given %matchspec. If $phase is not +provided remove handlers from all phases. + +Be careful as calling this function with %matchspec that is not not +specific enough can remove handlers not owned by you. It's probably +better to use the set_my_handler() method instead. + +The removed handlers are returned. + +=item $ua->set_my_handler( $phase, $cb, %matchspec ) + +Set handlers private to the executing subroutine. Works by defaulting +an C<owner> field to the %matchhspec that holds the name of the called +subroutine. You might pass an explicit C<owner> to override this. + +If $cb is passed as C<undef>, remove the handler. + +=item $ua->get_my_handler( $phase, %matchspec ) + +=item $ua->get_my_handler( $phase, %matchspec, $init ) + +Will retrieve the matching handler as hash ref. + +If C<$init> is passed passed as a TRUE value, create and add the +handler if it's not found. If $init is a subroutine reference, then +it's called with the created handler hash as argument. This sub might +populate the hash with extra fields; especially the callback. If +$init is a hash reference, merge the hashes. + +=item $ua->handlers( $phase, $request ) + +=item $ua->handlers( $phase, $response ) + +Returns the handlers that apply to the given request or response at +the given processing phase. + +=back + +=head1 REQUEST METHODS + +The methods described in this section are used to dispatch requests +via the user agent. The following request methods are provided: + +=over + +=item $ua->get( $url ) + +=item $ua->get( $url , $field_name => $value, ... ) + +This method will dispatch a C<GET> request on the given $url. Further +arguments can be given to initialize the headers of the request. These +are given as separate name/value pairs. The return value is a +response object. See L<HTTP::Response> for a description of the +interface it provides. + +There will still be a response object returned when LWP can't connect to the +server specified in the URL or when other failures in protocol handlers occur. +These internal responses use the standard HTTP status codes, so the responses +can't be differentiated by testing the response status code alone. Error +responses that LWP generates internally will have the "Client-Warning" header +set to the value "Internal response". If you need to differentiate these +internal responses from responses that a remote server actually generates, you +need to test this header value. + +Fields names that start with ":" are special. These will not +initialize headers of the request but will determine how the response +content is treated. The following special field names are recognized: + + :content_file => $filename + :content_cb => \&callback + :read_size_hint => $bytes + +If a $filename is provided with the C<:content_file> option, then the +response content will be saved here instead of in the response +object. If a callback is provided with the C<:content_cb> option then +this function will be called for each chunk of the response content as +it is received from the server. If neither of these options are +given, then the response content will accumulate in the response +object itself. This might not be suitable for very large response +bodies. Only one of C<:content_file> or C<:content_cb> can be +specified. The content of unsuccessful responses will always +accumulate in the response object itself, regardless of the +C<:content_file> or C<:content_cb> options passed in. + +The C<:read_size_hint> option is passed to the protocol module which +will try to read data from the server in chunks of this size. A +smaller value for the C<:read_size_hint> will result in a higher +number of callback invocations. + +The callback function is called with 3 arguments: a chunk of data, a +reference to the response object, and a reference to the protocol +object. The callback can abort the request by invoking die(). The +exception message will show up as the "X-Died" header field in the +response returned by the get() function. + +=item $ua->head( $url ) + +=item $ua->head( $url , $field_name => $value, ... ) + +This method will dispatch a C<HEAD> request on the given $url. +Otherwise it works like the get() method described above. + +=item $ua->post( $url, \%form ) + +=item $ua->post( $url, \@form ) + +=item $ua->post( $url, \%form, $field_name => $value, ... ) + +=item $ua->post( $url, $field_name => $value,... Content => \%form ) + +=item $ua->post( $url, $field_name => $value,... Content => \@form ) + +=item $ua->post( $url, $field_name => $value,... Content => $content ) + +This method will dispatch a C<POST> request on the given $url, with +%form or @form providing the key/value pairs for the fill-in form +content. Additional headers and content options are the same as for +the get() method. + +This method will use the POST() function from C<HTTP::Request::Common> +to build the request. See L<HTTP::Request::Common> for a details on +how to pass form content and other advanced features. + +=item $ua->mirror( $url, $filename ) + +This method will get the document identified by $url and store it in +file called $filename. If the file already exists, then the request +will contain an "If-Modified-Since" header matching the modification +time of the file. If the document on the server has not changed since +this time, then nothing happens. If the document has been updated, it +will be downloaded again. The modification time of the file will be +forced to match that of the server. + +The return value is the the response object. + +=item $ua->request( $request ) + +=item $ua->request( $request, $content_file ) + +=item $ua->request( $request, $content_cb ) + +=item $ua->request( $request, $content_cb, $read_size_hint ) + +This method will dispatch the given $request object. Normally this +will be an instance of the C<HTTP::Request> class, but any object with +a similar interface will do. The return value is a response object. +See L<HTTP::Request> and L<HTTP::Response> for a description of the +interface provided by these classes. + +The request() method will process redirects and authentication +responses transparently. This means that it may actually send several +simple requests via the simple_request() method described below. + +The request methods described above; get(), head(), post() and +mirror(), will all dispatch the request they build via this method. +They are convenience methods that simply hides the creation of the +request object for you. + +The $content_file, $content_cb and $read_size_hint all correspond to +options described with the get() method above. + +You are allowed to use a CODE reference as C<content> in the request +object passed in. The C<content> function should return the content +when called. The content can be returned in chunks. The content +function will be invoked repeatedly until it return an empty string to +signal that there is no more content. + +=item $ua->simple_request( $request ) + +=item $ua->simple_request( $request, $content_file ) + +=item $ua->simple_request( $request, $content_cb ) + +=item $ua->simple_request( $request, $content_cb, $read_size_hint ) + +This method dispatches a single request and returns the response +received. Arguments are the same as for request() described above. + +The difference from request() is that simple_request() will not try to +handle redirects or authentication responses. The request() method +will in fact invoke this method for each simple request it sends. + +=item $ua->is_protocol_supported( $scheme ) + +You can use this method to test whether this user agent object supports the +specified C<scheme>. (The C<scheme> might be a string (like 'http' or +'ftp') or it might be an URI object reference.) + +Whether a scheme is supported, is determined by the user agent's +C<protocols_allowed> or C<protocols_forbidden> lists (if any), and by +the capabilities of LWP. I.e., this will return TRUE only if LWP +supports this protocol I<and> it's permitted for this particular +object. + +=back + +=head2 Callback methods + +The following methods will be invoked as requests are processed. These +methods are documented here because subclasses of C<LWP::UserAgent> +might want to override their behaviour. + +=over + +=item $ua->prepare_request( $request ) + +This method is invoked by simple_request(). Its task is to modify the +given $request object by setting up various headers based on the +attributes of the user agent. The return value should normally be the +$request object passed in. If a different request object is returned +it will be the one actually processed. + +The headers affected by the base implementation are; "User-Agent", +"From", "Range" and "Cookie". + +=item $ua->redirect_ok( $prospective_request, $response ) + +This method is called by request() before it tries to follow a +redirection to the request in $response. This should return a TRUE +value if this redirection is permissible. The $prospective_request +will be the request to be sent if this method returns TRUE. + +The base implementation will return FALSE unless the method +is in the object's C<requests_redirectable> list, +FALSE if the proposed redirection is to a "file://..." +URL, and TRUE otherwise. + +=item $ua->get_basic_credentials( $realm, $uri, $isproxy ) + +This is called by request() to retrieve credentials for documents +protected by Basic or Digest Authentication. The arguments passed in +is the $realm provided by the server, the $uri requested and a boolean +flag to indicate if this is authentication against a proxy server. + +The method should return a username and password. It should return an +empty list to abort the authentication resolution attempt. Subclasses +can override this method to prompt the user for the information. An +example of this can be found in C<lwp-request> program distributed +with this library. + +The base implementation simply checks a set of pre-stored member +variables, set up with the credentials() method. + +=item $ua->progress( $status, $request_or_response ) + +This is called frequently as the response is received regardless of +how the content is processed. The method is called with $status +"begin" at the start of processing the request and with $state "end" +before the request method returns. In between these $status will be +the fraction of the response currently received or the string "tick" +if the fraction can't be calculated. + +When $status is "begin" the second argument is the request object, +otherwise it is the response object. + +=back + +=head1 SEE ALSO + +See L<LWP> for a complete overview of libwww-perl5. See L<lwpcook> +and the scripts F<lwp-request> and F<lwp-download> for examples of +usage. + +See L<HTTP::Request> and L<HTTP::Response> for a description of the +message objects dispatched and received. See L<HTTP::Request::Common> +and L<HTML::Form> for other ways to build request objects. + +See L<WWW::Mechanize> and L<WWW::Search> for examples of more +specialized user agents based on C<LWP::UserAgent>. + +=head1 COPYRIGHT + +Copyright 1995-2009 Gisle Aas. + +This library is free software; you can redistribute it and/or +modify it under the same terms as Perl itself. |