use strictures;
use LWP::UserAgent;

# my ($content,$decoded,$req,$res);
# ^^^ No! Nothing in the full scope, please.

my $ua = LWP::UserAgent->new;
$ua->default_header('Content-Type' => 'application/json');
$ua->default_header('Accept' => 'application/json, text/javascript, */*; q=0.01');

while ( my $url = your_url_generator_lister() )
{
    my $response = $ua->get($url);
    # do whatcha gonna do with it.
}