(.NET Core C#) SOAP with MTOM XOP 8bit (binary) Attachment

Demonstrates how to send the following sample SOAP request with an MTOM/XOP attachment:

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: _LT_5aeaa450-17f0-4484-b845-a8480c363444@example.org_GT_
Content-Disposition: 8bit

... binary data ...

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

Chilkat.Http http = new Chilkat.Http();

Chilkat.Xml soapXml = new Chilkat.Xml();

soapXml.Tag = "soap:Envelope";
bool success = soapXml.AddAttribute("xmlns:soap","http://schemas.xmlsoap.org/soap/envelope/");

soapXml.NewChild2("soap:Body","");
success = soapXml.GetChild2(0);

soapXml.NewChild2("Detail","");
success = soapXml.GetChild2(0);
success = soapXml.AddAttribute("xmlns","http://example.org/mtom/data");

soapXml.NewChild2("image","");
success = soapXml.GetChild2(0);

soapXml.NewChild2("xop:Include","");
success = soapXml.GetChild2(0);
success = soapXml.AddAttribute("xmlns:xop","http://www.w3.org/2004/08/xop/include");
success = soapXml.AddAttribute("href","cid:5aeaa450-17f0-4484-b845-a8480c363444@example.org");

soapXml.GetRoot2();
soapXml.EmitXmlDecl = false;

string xmlBody = soapXml.GetXml();
Debug.WriteLine(xmlBody);

Chilkat.HttpRequest req = 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>");

// Add the Content-Disposition: 8bit sub-header
success = req.AddSubHeader(1,"Content-Disposition","8bit");

http.FollowRedirects = true;

// For debugging, set the SessionLogFilename property
// to see the exact HTTP request and response in a log file.
// (Given that the request contains binary data, you'll need an editor
// that can gracefully view text + binary data.  I use EmEditor for most simple editing tasks..)
http.SessionLogFilename = "qa_output/mtom_sessionLog.txt";

bool useTls = true;
// Note: Please don't run this example without changing the domain to your own domain...
Chilkat.HttpResponse resp = http.SynchronousRequest("www.example.org",443,useTls,req);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.Xml xmlResponse = new Chilkat.Xml();
success = xmlResponse.LoadXml(resp.BodyStr);
Debug.WriteLine(xmlResponse.GetXml());