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How to Access Parts of a multipart/related HTTP Response

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Demonstrates how to access the parts of a multipart/related response. This example sends a ficticious multipart/related request, and handles a ficticious multipart/related response.

We send the following multipart/related request:

Content-Type: multipart/related; start-info="text/xml"; type="application/xop+xml"; boundary="----=_Part_0_1744155.1118953559416"
Content-Length: 3453
SOAPAction: "some-SOAP-action"

------=_Part_1_4558657.1118953559446
Content-Type: application/xop+xml; type="text/xml"; charset=utf-8

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <Detail xmlns="http://example.org/mtom/data">
      <image>
        <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
      </image>
    </Detail>
  </soap:Body>
</soap:Envelope>

------=_Part_1_4558657.1118953559446
Content-Type: image/jpeg
Content-ID: <5aeaa450-17f0-4484-b845-a8480c363444@example.org>


... binary data ...

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Local $bSuccess = False

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oHttp = ObjCreate("Chilkat.Http")

$oSoapXml = ObjCreate("Chilkat.Xml")

; Build the following SOAP XML

; <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
;   <soap:Body>
;     <Detail xmlns="http://example.org/mtom/data">
;       <image>
;         <xop:Include xmlns:xop="http://www.w3.org/2004/08/xop/include" href="cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org" />
;       </image>
;     </Detail>
;   </soap:Body>
; </soap:Envelope>

$oSoapXml.Tag = "soap:Envelope"
$oSoapXml.AddAttribute("xmlns:soap","http://schemas.xmlsoap.org/soap/envelope/")
$oSoapXml.UpdateAttrAt("soap:Body|Detail",True,"xmlns","http://example.org/mtom/data")
$oSoapXml.UpdateAttrAt("soap:Body|Detail|image|xop:Include",True,"xmlns:xop","http://www.w3.org/2004/08/xop/include")
$oSoapXml.UpdateAttrAt("soap:Body|Detail|image|xop:Include",True,"href","cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org")

$oSoapXml.EmitXmlDecl = False
Local $sXmlBody = $oSoapXml.GetXml()
ConsoleWrite($sXmlBody & @CRLF)

$oReq = ObjCreate("Chilkat.HttpRequest")
$oReq.HttpVerb = "POST"
$oReq.Path = "/something/someTarget"

$oReq.ContentType = "multipart/related; start-info=""text/xml""; type=""application/xop+xml"""
$oReq.AddHeader "SOAPAction","some-SOAP-action"

$bSuccess = $oReq.AddStringForUpload2("","",$sXmlBody,"utf-8","application/xop+xml; type=""text/xml""; charset=utf-8")

; The bytes will be sent as binary (not base64 encoded).
$bSuccess = $oReq.AddFileForUpload2("","qa_data/jpg/starfish.jpg","image/jpeg")

; The JPEG data is the 2nd sub-part, and therefore is at index 1 (the first sub-part is at index 0)
$bSuccess = $oReq.AddSubHeader(1,"Content-ID","<5aeaa450-17f0-4484-b845-a8480c363444@example.org>")

$oHttp.FollowRedirects = True

Local $bUseTls = True
$oResp = ObjCreate("Chilkat.HttpResponse")
$bSuccess = $oHttp.HttpSReq("www.example.org",443,$bUseTls,$oReq,$oResp)
If ($bSuccess = False) Then
    ConsoleWrite($oHttp.LastErrorText & @CRLF)
    Exit
EndIf

; Imagine the HTTP response is multipart related and is something like this:

; HTTP/1.1 200 OK
; Cache-Control: no-cache, no-store
; Pragma: no-cache
; Transfer-Encoding: chunked
; Content-Type: multipart/related; boundary=------------080001080500020607080905
; Expires: -1
; Server: Microsoft-IIS/10.0
; X-AspNet-Version: 4.0.30319
; X-Powered-By: ASP.NET
; Date: Wed, 19 Feb 2020 15:27:06 GMT
; 
; --------------080001080500020607080905
; Content-Type: application/xop+xml; charset=iso-8859-1
; Content-Id: RootPart
; Content-Transfer-Encoding: binary
; 
; <?xml version="1.0" encoding="iso-8859-1"?>
; <soapenv:Envelope xmlns:xcpt="...">
;   <soapenv:Header />
;   <soapenv:Body>
;     <xres:Transport profile="http://something.example.com/..." version="1.4">
;       <xres:TransportHeader>
; 	...
; 	...
;       </xres:TransportHeader>
;       <xres:TransportBody />
;     </xres:Transport>
;   </soapenv:Body>
; </soapenv:Envelope>
; --------------080001080500020607080905--

; To get the XML, load the full MIME of the response into a Chilkat MIME object.  Then get the body of the 1st sub-part.
$oMime = ObjCreate("Chilkat.Mime")
$oMime.LoadMime($oResp.FullMime)

; Your code might verify that the Content-Type is indeed multipart/related.
ConsoleWrite($oMime.ContentType & @CRLF)
ConsoleWrite("num parts = " & $oMime.NumParts & @CRLF)

; Assuming it is, and the number of sub-parts is > 0
If ($oMime.NumParts > 0) Then

    $oPart0 = ObjCreate("Chilkat.Mime")
    $oMime.PartAt(0,$oPart0)

    ; The Content-Type (in this ficticious example) should be "application/xop+xml"
    ConsoleWrite("sub-part Content-Type: " & $oPart0.ContentType & @CRLF)
    ; Now get the XML 
Local $subPartXmlBody = $oPart0.GetBodyDecoded()
    ConsoleWrite($subPartXmlBody & @CRLF)
EndIf