Client connection to a SOAP service with authentication 

Is there an example to look at for a connection to a server with authentication? Something that is able to produce a header like this one below:

```
<soapenv:Header>
  <soap:SOAPAutenticazione>
     <username>XXXXXXX</username>
     <password>YYYYYYYY</password>
     <nomeServizio>VisOperSiRPV</nomeServizio>
  </soap:SOAPAutenticazione>
</soapenv:Header>
```

Many thanks in advance.