How to get the Data from a SOAP Header

Hey,

i am programming a java module for SAP PI. now i am reading the "moduleContext" an the "inputModuleData".

At present I only get the payload from the message like this:

Object obj = null;

Message msg = null;

obj = inputModuleData.getPrincipalData();

msg = (Message) obj;

But as I said ..it is just the ´"payload" and i need the SOAP Header

Any ideas. What i ve to do?

Thanks