Need help forming html+xml message.

The gateway device response to the SSDP with
LOCATION:
http://192.168.2.1:80/x_internetgatewaydevice.xml
Within that xml file there is refrence to
x_wanipconnection.xml
<SCPDURL>http://192.168.2.1:80/x_wanipconnection.xml</SCPDURL>
and within that xml is the method I'm trying to
invoke.  The method
is called GetExternalIPAddress.
      <action>
         <name>GetExternalIPAddress</name>
         <argumentList>
            <argument>
               <name>NewExternalIPAddress</name>
               <direction>out</direction>
              
<relatedStateVariable>ExternalIPAddress</relatedStateVariable>
            </argument>
         </argumentList>
      </action>

---------------

This is what I've formed but it doesn't work... Can
you tell me
what I've done wrong?


POST /http://192.168.2.1:80/control?WANIPConnection
HTTP/1.1
HOST: 192.168.2.1:80
SOAPACTION:
"schemas-upnp-org:device:InternetGatewayDevice:1#GetExternalIPAddress"
CONTENT-TYPE: text/xml ; charset="utf-8"
Content-Length: 284

<?xml version="1.0"?>
<soap:Envelope
xmlns:soap="http://www.w3.org/2001/12/soap-envelope"
soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding">

 <soap:Body>
  <m:GetExternalIPAddress
xmlns:m=http://192.168.2.1:80/control?WANIPConnection">
 </soap:Body>
</soap:Envelope>

-----------------------------------
This is what the server replies:
-----------------------------------

HTTP/1.1 500 Internal Server Error
Content-Type: text/xml; charset="utf-8"
Content-Length: 400
Date: Wed, 22 Sep 2004 20:04:05 GMT
Server: Custom/1.0 UPnP/1.0 Prod/Ver
EXT:


<s:Envelope
xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
 <s:Body>
  <s:Fault>
   <faultcode>s:Client</faultcode>
   <faultstring>UPnPError</faultstring>
   <detail>
    <UPnPError
xmlns="urn:schemas-upnp-org:control-1-0">
     <errorCode>401</errorCode>
     <errorDescription>Invalid
Action</errorDescription>
    </UPnPError>
   </detail>
  </s:Fault>
 </s:Body>
</s:Envelope>

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