SOAPAction in http header

I'm trying to access a .net web-service with an XForm. The service requires the use of SOAPAction: "" parameter in the http header. I have tried (and failed) to get this to be output from an XForm with both formsplayer 1.3 and novell. This is the submission I'm using:

<xf:submission id="submit1" ref="/" method="post" action="http://localhost/XFormValidator/Service1.asmx" mediatype="text/xml" omit-xml-declaration="no" replace="instance" instance="results"/>

But this gives an internal server error, because the SOAPAction: "" parameter is missing.

How do you get control of the http header? Does anyone know of any examples of using post method to consume a .net web service with an XForm?

Cheers,

Jon

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