WSE 3.0 web service rejects MTOM request

[SimonePringle]

The MTOM request below is rejected by a WSE 3.0 web service, indicating that it is a "Bad Request" - HTTP error 400.

The IIS configuration has set up the service to accept MTOM messaging (optional).

Can anyone see what about this POST makes it a bad request? Thanks!
Simone

POST /DocumentLibraryService/DocumentLibraryService.asmx HTTP/1.1
SOAPAction: "http://www.dotnetslackers.com/wse/documentlibrarysample/UploadDocument"
Content-Type: multipart/related; startinfo="application/xop+xml"; type="application/xop+xml"; start="<[e-mail]>"; boundary="----=_Part_31_14024931.1187034199799"
MIME-Version: 1.0
User-Agent: Jakarta Commons-HttpClient/3.0.1
Proxy-Connection: Keep-Alive
Host: itd-xp1134
Content-Length: 987


------=_Part_31_14024931.1187034199799
Content-Type: application/xop+xml; charset=UTF-8; type="text/xml; action=\"UploadDocument\""
Content-Transfer-Encoding: 8bit
Content-ID: <[e-mail]>

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:doc="http://www.dotnetslackers.com/wse/documentlibrarysample" xmlns:xm="http://www.w3.org/2005/05/xmlmime">
<soapenv:Header/>
<soapenv:Body>
<doc:UploadDocument>
<!--Optional:-->
<doc:fileName>Test.txt</doc:fileName>
<!--Optional:-->
<doc:data xm:contentType="text/plain"><inc:Include href="cid:1187034131079" xmlns:inc="http://www.w3.org/2004/08/xop/include"/></doc:data>
</doc:UploadDocument>
</soapenv:Body>
</soapenv:Envelope>
------=_Part_31_14024931.1187034199799
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-ID: <1187034131079>

Test


------=_Part_31_14024931.1187034199799--