Multipart upload using dispatch-mime lib

gistfile1.scala

import dispatch.classic./\
import dispatch.classic.mime.Mime.MimeRequestTerms

    val multipart = new MimeRequestTerms(/\) <<*("counterparty-file", anyString(), bytes)
    val byteStream = new ByteArrayOutputStream()
    multipart.body.get.writeTo(byteStream)

    Request(url, RequestMethods.POST,
      Map(HttpHeaders.ContentType.value -> multipart.body.get.getContentType.getValue),
      byteStream.toByteArray)