Since QTP is vbscript, you can use CreateObject. Look at the Microsoft.XmlHttp samples with the open and send functions.

xmlhttp.Open ''GET'', ''SomeURL''

xmlhttp.setRequestHeader ''name'', ''value''

xmlhttp.send YourData

Thanks, I think that will work. But I did need to have it attached to a web service request. I found that the action ''.Headers.AddHTTPHeader'' did what I needed it to do.

Example:
WebService(''WebServiceName'').Headers.AddHTTPHeader''Name'', ''Value''

I also discovered that HP's help on Service Test 11 was incorrect. If they have not updated it yet the correct implementation is to place the following code in the user code of the ''OnSendRequest'' event.

Code:
This.StServiceCallActivity4.HttpRequestHeaders[''name''] = ''value'';