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package LWP::Simple; use strict; our $VERSION = '6.34'; require Exporter; our @EXPORT = qw(get head getprint getstore mirror); our @EXPORT_OK = qw($ua); # I really hate this. It was a bad idea to do it in the first place. # Wonder how to get rid of it??? (It even makes LWP::Simple 7% slower # for trivial tests) use HTTP::Status; push(@EXPORT, @HTTP::Status::EXPORT); sub import { my $pkg = shift; my $callpkg = caller; Exporter::export($pkg, $callpkg, @_); } use LWP::UserAgent (); use HTTP::Date (); our $ua = LWP::UserAgent->new; # we create a global UserAgent object $ua->agent("LWP::Simple/$VERSION "); $ua->env_proxy; sub get ($) { my $response = $ua->get(shift); return $response->decoded_content if $response->is_success; return undef; } sub head ($) { my($url) = @_; my $request = HTTP::Request->new(HEAD => $url); my $response = $ua->request($request); if ($response->is_success) { return $response unless wantarray; return (scalar $response->header('Content-Type'), scalar $response->header('Content-Length'), HTTP::Date::str2time($response->header('Last-Modified')), HTTP::Date::str2time($response->header('Expires')), scalar $response->header('Server'), ); } return; } sub getprint ($) { my($url) = @_; my $request = HTTP::Request->new(GET => $url); local($\) = ""; # ensure standard $OUTPUT_RECORD_SEPARATOR my $callback = sub { print $_[0] }; if ($^O eq "MacOS") { $callback = sub { $_[0] =~ s/\015?\012/\n/g; print $_[0] } } my $response = $ua->request($request, $callback); unless ($response->is_success) { print STDERR $response->status_line, " <URL:$url>\n"; } $response->code; } sub getstore ($$) { my($url, $file) = @_; my $request = HTTP::Request->new(GET => $url); my $response = $ua->request($request, $file); $response->code; } sub mirror ($$) { my($url, $file) = @_; my $response = $ua->mirror($url, $file); $response->code; } 1; __END__ =pod =head1 NAME LWP::Simple - simple procedural interface to LWP =head1 SYNOPSIS perl -MLWP::Simple -e 'getprint "http://www.sn.no"' use LWP::Simple; $content = get("http://www.sn.no/"); die "Couldn't get it!" unless defined $content; if (mirror("http://www.sn.no/", "foo") == RC_NOT_MODIFIED) { ... } if (is_success(getprint("http://www.sn.no/"))) { ... } =head1 DESCRIPTION This module is meant for people who want a simplified view of the libwww-perl library. It should also be suitable for one-liners. If you need more control or access to the header fields in the requests sent and responses received, then you should use the full object-oriented interface provided by the L<LWP::UserAgent> module. The module will also export the L<LWP::UserAgent> object as C<$ua> if you ask for it explicitly. The user agent created by this module will identify itself as C<LWP::Simple/#.##> and will initialize its proxy defaults from the environment (by calling C<< $ua->env_proxy >>). =head1 FUNCTIONS The following functions are provided (and exported) by this module: =head2 get my $res = get($url); The get() function will fetch the document identified by the given URL and return it. It returns C<undef> if it fails. The C<$url> argument can be either a string or a reference to a L<URI> object. You will not be able to examine the response code or response headers (like C<Content-Type>) when you are accessing the web using this function. If you need that information you should use the full OO interface (see L<LWP::UserAgent>). =head2 head my $res = head($url); Get document headers. Returns the following 5 values if successful: ($content_type, $document_length, $modified_time, $expires, $server) Returns an empty list if it fails. In scalar context returns TRUE if successful. =head2 getprint my $code = getprint($url); Get and print a document identified by a URL. The document is printed to the selected default filehandle for output (normally STDOUT) as data is received from the network. If the request fails, then the status code and message are printed on STDERR. The return value is the HTTP response code. =head2 getstore my $code = getstore($url, $file) Gets a document identified by a URL and stores it in the file. The return value is the HTTP response code. =head2 mirror my $code = mirror($url, $file); Get and store a document identified by a URL, using I<If-modified-since>, and checking the I<Content-Length>. Returns the HTTP response code. =head1 STATUS CONSTANTS This module also exports the L<HTTP::Status> constants and procedures. You can use them when you check the response code from L<LWP::Simple/getprint>, L<LWP::Simple/getstore> or L<LWP::Simple/mirror>. The constants are: RC_CONTINUE RC_SWITCHING_PROTOCOLS RC_OK RC_CREATED RC_ACCEPTED RC_NON_AUTHORITATIVE_INFORMATION RC_NO_CONTENT RC_RESET_CONTENT RC_PARTIAL_CONTENT RC_MULTIPLE_CHOICES RC_MOVED_PERMANENTLY RC_MOVED_TEMPORARILY RC_SEE_OTHER RC_NOT_MODIFIED RC_USE_PROXY RC_BAD_REQUEST RC_UNAUTHORIZED RC_PAYMENT_REQUIRED RC_FORBIDDEN RC_NOT_FOUND RC_METHOD_NOT_ALLOWED RC_NOT_ACCEPTABLE RC_PROXY_AUTHENTICATION_REQUIRED RC_REQUEST_TIMEOUT RC_CONFLICT RC_GONE RC_LENGTH_REQUIRED RC_PRECONDITION_FAILED RC_REQUEST_ENTITY_TOO_LARGE RC_REQUEST_URI_TOO_LARGE RC_UNSUPPORTED_MEDIA_TYPE RC_INTERNAL_SERVER_ERROR RC_NOT_IMPLEMENTED RC_BAD_GATEWAY RC_SERVICE_UNAVAILABLE RC_GATEWAY_TIMEOUT RC_HTTP_VERSION_NOT_SUPPORTED =head1 CLASSIFICATION FUNCTIONS The L<HTTP::Status> classification functions are: =head2 is_success my $bool = is_success($rc); True if response code indicated a successful request. =head2 is_error my $bool = is_error($rc) True if response code indicated that an error occurred. =head1 CAVEAT Note that if you are using both LWP::Simple and the very popular L<CGI> module, you may be importing a C<head> function from each module, producing a warning like C<Prototype mismatch: sub main::head ($) vs none>. Get around this problem by just not importing LWP::Simple's C<head> function, like so: use LWP::Simple qw(!head); use CGI qw(:standard); # then only CGI.pm defines a head() Then if you do need LWP::Simple's C<head> function, you can just call it as C<LWP::Simple::head($url)>. =head1 SEE ALSO L<LWP>, L<lwpcook>, L<LWP::UserAgent>, L<HTTP::Status>, L<lwp-request>, L<lwp-mirror> =cut