malformed JSON string, neither tag, array, object, number, string or atom, at character offset 0 (before "Can't connect to ip...")

##</code><code>##

my $req = HTTP::Request->new(POST => 'http://ip:4000');
$req->content_type('application/x-www-form-urlencoded');
$req->content_type('application/json');
my $res = $ua->request($req);
$respons = JSON::XS->new->decode ($res->content);
$dat = $respons->{data};
$adat1 = $respons->{name};