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(Xojo Plugin) How to Access Parts of a multipart/related HTTP Response

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 ...

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

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

Dim http As New Chilkat.Http

Dim soapXml As New 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>

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

soapXml.EmitXmlDecl = False
Dim xmlBody As String
xmlBody = soapXml.GetXml()
System.DebugLog(xmlBody)

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "POST"
req.Path = "/something/someTarget"

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

success = req.AddStringForUpload2("","",xmlBody,"utf-8","application/xop+xml; type=""text/xml""; charset=utf-8")

// The bytes will be sent as binary (not base64 encoded).
success = req.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)
success = req.AddSubHeader(1,"Content-ID","<5aeaa450-17f0-4484-b845-a8480c363444@example.org>")

http.FollowRedirects = True

Dim useTls As Boolean
useTls = True
Dim resp As Chilkat.HttpResponse
resp = http.SynchronousRequest("www.example.org",443,useTls,req)
If (http.LastMethodSuccess <> True) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// 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.
Dim mime As New Chilkat.Mime
success = mime.LoadMime(resp.FullMime)

// Your code might verify that the Content-Type is indeed multipart/related.
System.DebugLog(mime.ContentType)
System.DebugLog("num parts = " + Str(mime.NumParts))

// Assuming it is, and the number of sub-parts is > 0
If (mime.NumParts > 0) Then
    Dim part0 As Chilkat.Mime
    part0 = mime.GetPart(0)
    // The Content-Type (in this ficticious example) should be "application/xop+xml"
    System.DebugLog("sub-part Content-Type: " + part0.ContentType)
    // Now get the XML 
    Dim subPartXmlBody As String
    subPartXmlBody = part0.GetBodyDecoded()
    System.DebugLog(subPartXmlBody)

End If


 

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