Consider using LWP::Simple::mirror for your specific task. There's a good example of its use in the article about LWP::Simple on the 22nd day of the 2003 Perl Advent Calendar.
Here's my own example:
#!C:/Perl/bin/perl.exe
use strict;
use warnings;
use LWP::Simple qw( mirror is_error RC_NOT_MODIFIED );
my $url = 'http://rabbit.eng.miami.edu/dics/pocket.txt';
my $file = $url;
$file =~ s{.*/}{};
my $status = mirror($url, $file);
if (is_error($status)) {
die "Can't get text file at URL $url\n";
}
if ($status == RC_NOT_MODIFIED) {
warn "File $file not modified\n";
}
# Do something with freshened file named pocket.txt...
exit 0;
See 14.13 Content-Length and 14.25 If-Modified-Since for the gory details of what's going on under the hood.
Cheers!
Jim
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