Description:
------------
When trying to connect to a SOAP with php 5.6.17-27 you get a SoapFault exception

Fatal error: Uncaught SoapFault exception: [Client] looks like we got no XML document in SoapClient->__soapCall('getStudentName', Array)

same exact code works fine on PHP 7.0.10


I have broken down the code below into two files.

Test script:
---------------
//[CLIENT]
//client.php
class client{
    public function __construct()
    {
        $params = array(
            'location' => 'http://test.local/SOAP/server.php',
            'uri' => 'urn://test.local/SOAP/server.php',
            'trace' => 1
            );
        $this->instance = new SoapClient(NULL, $params);
    }
    public function getName($pram){
        return $this->instance->__soapCall('getStudentName', $pram);
    }
}
$client = new client();
$id_array = array('id' => '1');
echo $client->getName($id_array);

//[SERVER]
//server.php
class server
{
    public function getStudentName($array){
        return 'sam';
    }
}
$options= array('uri'=>'test.local/SOAP/server.php');
$server=new SoapServer(NULL, $options);
$server->setClass('server');
$server->addFunction('getStudentName');
$server->handle();

Expected result:
----------------
Should echo out "sam" to the screen when you load client.php

Actual result:
--------------
Fatal error: Uncaught SoapFault exception: [Client] looks like we got no XML document in C:\wamp64\www\test\SOAP\client.php:33 Stack trace: #0 C:\wamp64\www\test\SOAP\client.php(33): SoapClient->__soapCall('getStudentName', Array) #1 C:\wamp64\www\test\SOAP\service.php(11): client->getName(Array) #2 {main} thrown in C:\wamp64\www\test\SOAP\client.php on line 33