NuSOAP: how to change content-type of request?

Question

When consuming a .NET WCF webservice I get the following response (error):

Unsupported HTTP response status 415 Cannot process the message because t

Answer 1

This worked for me:

$client = new nusoap_client($params);

$client->soap_defencoding = 'UTF-8';

The answer that is ticked as correct is not for NUSOAP therefore not the appropriate answer.