POST /blabla HTTP/1.1
HOST: www.moobaa.com
SOAPAction: "ebXML"
Content-Type: multipart/related;
type="text/xml";
boundary="--balbla123123--";
start="ebXML_Message_Header"

--balbla123123--
Content-type: text/xml
content-id: <header154>

<?xml version="1.0" encoding="UTF-8"?>
  <bla> mooo </bla>

--Part-580226588-1116412634154-660--