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ColdFusion SOAP response with attachments

I am using Coldfusion9 to interact with a 3rd party SOAP service with which I need to both send and receive SOAP with attachments. I am having no issue in receiving the SOAP which may or may not have binary attachments by using ToString() around the HTTP content to convert the SOAP Body into a usable string, however the service requires that I send my response back using attachments as well which is where I am coming undone. I've just never done this in ColdFusion and i'm not exactly sure how I should be presenting this to the originating service so that the SOAP body is referenced via an ID.

Below is the parsing of the incoming SOAP data with attachments:

<cfset soapData = GetHttpRequestData()>

<!--- Loop over the HTTP headers and dump the SOAP content into a variable --->
<cfsavecontent variable="soapContent">
<cfoutput>      
    <cfloop collection = #soapData.headers# item = "http_item">
    #http_item#: #StructFind(soapData.headers, http_item)# #chr(10)##chr(13)# 
    </cfloop>
    request_method: #soapData.method# #chr(10)##chr(13)# 
    server_protocol: #soapData.protocol# #chr(10)##chr(13)# 
    http_content --- #chr(10)##chr(13)#  
    #toString(soapData.content)#
</cfoutput>
</cfsavecontent>

<!--- Save file to flat file --->
<cffile action = "write" 
    file = "#expandPath('../')#logs/#dateFormat(now(),'dd-mm-yyyy')#_#timeFormat(now(),'HHmmss')#.txt" 
    output = "#soapContent#">

Now I am currently presenting the response as a full SOAP XML response containing the body as inline XML with the required STATUSCODE (see below).

<cfsavecontent variable="strResponse">
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAPENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/1999/XMLSchema" xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance">
    <SOAPENV:Body>
        <ns1:processResponse xmlns:ns1="urn:TripFlow" SOAPENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
            <STATUSLVL>00</STATUSLVL>
        </ns1:processResponse>
    </SOAP-ENV:Body>
</SOAPENV:Envelope>
</cfsavecontent>

<!--- Strip all whitespace between tags --->
<cfset strResponse = trim(ReReplaceNoCase(strResponse,'(>[\s]*<)','><','ALL'))>

<!--- Output the XML response to the soap service --->
<cfoutput>#strResponse#</cfoutput>

The above response is throwing an error because the SOAP service requires the response to be sent referencing the body message as an attachment exactly like follows from the documentation:

HTTP/1.1 200 OK
Date: Thu, 01 Apr 2010 09:30:25 GMT
Server: Jetty/5.1.4 (Windows XP/5.1 x86 java/1.5.0_15
Content-Type: multipart/related; boundary=soaptestserver; type="text/xml"; start="<theenvelope>"
SOAPAction: ""
Content-Length: 796
Connection: close

--soaptestserver
Content-ID: <theenvelope>
Content-Transfer-Encoding: 8bit
Content-Type: text/xml; charset=utf-8
Content-Length: 442

<?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:SOAPENV="
http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/1999/XMLSchema"
xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance"><SOAPENV:
Body><ns1:processResponse xmlns:ns1="urn:TripFlow" SOAPENV:
encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><message
rel='nofollow' href="cid:thecontentmessage"/></ns1:processResponse></SOAP-ENV:Body></SOAPENV:
Envelope>

--soaptestserver
SOAP Interface
www.travelsolutions.com 123
travel solutions online V14.0 External System Integration
Content-ID: <thecontentmessage>
Content-Transfer-Encoding: 8bit
Content-Type: text/xml; charset=utf-8
Content-Length: 65

<?xml version="1.0" encoding="UTF-8"?><STATUSLVL>00</STATUSLVL>
--soaptestserver--

Any help would be greatly appreciate as i'm really hitting my head up against a wall on this one. Thanks!