No, Perl allows it whether you write the module or not. At issue is not what Perl allows, but what Perl provides. Perl does not provide a means of accessing a file through a file handle. Well, not directly. It's pretty darn simple to do, though.

my $response = $ua->get($url);
$response->is_success()
    or die("Can't get $url: ", $response->status_line(), "\n");

my $content = $response->decoded_content( charset => 'none' );
open(my $fh, '<', \$content)
    or die("Can't open scalar: $!\n");
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