This works:

use WWW::Curl::Easy;
my $curl = WWW::Curl::Easy->new;

$curl->setopt(CURLOPT_HEADER,0);
$curl->setopt(CURLOPT_TIMEOUT, 30);
$curl->setopt(CURLOPT_FOLLOWLOCATION, 1);


$curl->setopt(CURLOPT_URL, 'http://example.com');

my $response_body = '';
open(my $fileb, ">", \$response_body);
$curl->setopt(CURLOPT_WRITEDATA,$fileb);

my $retcode = $curl->perform;
if ($retcode == 0) {
        print("Received response: $response_body\n");
} else {
        print("An error happened: $retcode ".$curl->strerror($retcode)
+." ".$curl->errbuf."\n");
}
[download]

This failed with "An error happened: 3 URL using bad/illegal format or missing URL No URL set!":

require WWW::Curl::Easy;
import WWW::Curl::Easy;
my $curl = WWW::Curl::Easy->new;

$curl->setopt(CURLOPT_HEADER,0);
$curl->setopt(CURLOPT_TIMEOUT, 30);
$curl->setopt(CURLOPT_FOLLOWLOCATION, 1);


$curl->setopt(CURLOPT_URL, 'http://example.com');

my $response_body = '';
open(my $fileb, ">", \$response_body);
$curl->setopt(CURLOPT_WRITEDATA,$fileb);

my $retcode = $curl->perform;
if ($retcode == 0) {
        print("Received response: $response_body\n");
} else {
        print("An error happened: $retcode ".$curl->strerror($retcode)
+." ".$curl->errbuf."\n");
}
[download]

why? I really need to use 'require' instead of 'use', please help.

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