Multipart/mixed POST to Tableau's REST api via NodeJS

gistfile1.txt

var FormData = require('form-data');
var fs = require('fs');
var XMLWriter = require('xml-writer');

...

  var dsXml = new XMLWriter();
  dsXml.startElement('tsRequest')
              .startElement('datasource')
              .writeAttribute('name', "file")
                  .startElement('project')
                      .writeAttribute('id', projectID)
                  .endElement()
              .endElement()
          .endElement();
  console.log(dsXml.toString());

var CRLF = '\r\n';
var form = new FormData();


form.append('request_payload', dsXml.toString(), {contentType: 'text/xml'});
form.append('tableau_datasource', 
          fs.createReadStream('c:\\file.tde'),
          {contentType: 'application/octet-stream'});

form.submit(
  {
      // Remove any protocol (like http://) from start of server name
      host: tableauServer.replace(/.*?:\/\//g, ""),
      //port: 8888, // uncomment to see your reqests in HTTP Proxies like Fiddler, Charles
      path: '/api/2.0/sites/' + siteID + '/datasources?overwrite=true',
      headers: {
          'X-Tableau-Auth': adminAuthToken, 
          'Content-Type': 'multipart/mixed; boundary=' + form.getBoundary()
      }
  }, function(err, res) {
        if (err) throw err;
       console.log(res.statusCode);
       var str = '';
        //another chunk of data has been recieved, so append it to `str`

        res.on('data', function (chunk) {
          str += chunk;
        });

        //the whole response has been recieved, so we just print it out here
        res.on('end', function () {
          console.log(str);
        });

  });
 
  res.end();