title: how can I send ISO-8859-1 XML file using SoapClient?
body: <p>I'm consuming a SOAP method which expects a XML content with ISO-8859-1 encoding. I tried add it directly as a method parameter but SoapClient returns an encoding error:</p>
  
  <blockquote>
    <p>SOAP-ERROR: Encoding: string '&lt;?xml version="1.0"
    encoding="ISO-8859-1"?&gt;(...)' is not a valid utf-8 string</p>
  </blockquote>
  
  <p>If I convert the XML content to UTF-8 the SOAP server doesn't recognize the XML content.</p>
  
  <p>Any solution using SoapClient?
  Any alternative using cURL?</p>