**Example**
    Sub Authenticate_AuthHeader()
        Dim XMLHttpRequestObj, ALMServer, ALMAuthString
        Set XMLHttpRequestObj  = CreateObject(''Msxml2.ServerXMLHTTP.6.0'')
        ALMServer = ''http://localhost:8080/qcbin''  ''<--No trailing slash
        ''Base64 encoded string of user:pass  Example:  Base64(''alex_alm:'') is YWxleF9hbG06
        ALMAuthString =  ''YWxleF9hbG06'' 
        XMLHttpRequestObj.open ''GET'', ALMServer & ''/authentication-point/authenticate'', False
        XMLHttpRequestObj.setRequestHeader ''Content-Type'',''application/xml''
        XMLHttpRequestObj.setRequestHeader ''Authorization'',''Basic '' & ALMAuthString
        XMLHttpRequestObj.send
        MsgBox ''-- Authenticate Header --'' & vbCrLf & _
        ''Status Code : '' & XMLHttpRequestObj.status &  vbCrLf & _
        ''Status Text   : '' & XMLHttpRequestObj.statusText & vbCrLf & _
        ''---------------------------'' & vbCrLf & vbCrLf & _
        ''Response Text : ''  & vbCrLf & XMLHttpRequestObj.responseText, , ''Authenticate''
        Set XMLHttpRequestObj = Nothing
    End Sub