Nusoap does not work in Laravel 5.6

I installed nusoap on laravel 5.6 and am trying to connect my SOAP client with my SOAP server. I installed the package in the "require econea / nusoap-dev-develop" composer.

My route is this:

Route :: get ('/ client', 'SOAP \ ClientController @ client'); Route :: any ('/ server', 'SOAP \ ServerController @ server');

This is my ClientController:

use App\Http\Controllers\Controller;
use nusoap_client;

class ClientController extends Controller
{public function client()
{
$client = new nusoap_client('http://localhost:8080/index.php/server? 
wsdl');

$response = $client->call('get_price','book');
if ($client->fault) {
    echo "<h2>Fault</h2><pre>";
    print_r($response);
    echo "</pre>";
} else {
    $error = $client->getError();
    if ($error) {
        echo "<h2>Error</h2><pre>" . $error . "</pre>";
    } else {
        echo "<h2>Main</h2>";
        echo $response;
    }
}
}
}

This is my ServerController:

use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Response;
use nusoap_server;

class ServidorController extends Controller
{public function server()
{

$server = new nusoap_server(); // Create a instance for nusoap server

$server->configureWSDL("Soap Demo", "urn:soapdemo"); // Configure WSDL 
file

$server->register(
    "get_price", // name of function
    array("name" => "xsd:string"),  // inputs
    array("return" => "xsd:integer")   // outputs
);
function get_price($name)
{
    $products = [
        "book" => 20,
        "pen" => 10,
        "pencil" => 5
    ];

    foreach ($products as $product => $price) {
        if ($product == $name) {
            return $price;
            break;
        }
    }
}

return Response::make($server- 
>service(file_get_contents("php://input")),
    200, array('Content-Type' => 'text/xml; charset=ISO-8859-1'));
}
}

And this is the answer from my server:

HTTP/1.0 419 unknown status
Host: 127.0.0.1:8080
Date: Tue, 08 May 2018 20:00:16 +0000
Connection: close
X-Powered-By: PHP/7.1.17-1+ubuntu16.04.1+deb.sury.org+1
Cache-Control: no-cache, private
date: Tue, 08 May 2018 20:00:16 GMT
Content-Type: text/html; charset=UTF-8
pragma: no-cache
expires: -1

Error Response not of type text/xml: text/html; charset=UTF-8

I'm using port 8080 pro server and port 8000 pro client.

Thank you.