httpbuilder-ng multipart/form-data with large application/zip part

Question

When trying to upload a large zip via multipart/form-data with httpbuilder-ng apache implementation version 0.16.1 i get

org.apache.http.ContentTooLongException: Content length is too long: 109370 at org.apache.http.entity.mime.MultipartFormEntity.getContent(MultipartFormEntity.java:103) at groovyx.net.http.ApacheEncoders.multipart(ApacheEncoders.java:74)

and that is Ok because the zip is rather large and there's no reason to wiggle it around buffers and ByteArray[Input|Output]Stream, question is how do i actually send the multipart to the connection's output stream? i tried to customize the encoder but the ToServer only exposes one method that accepts an InputStream which doesn't really work for me

Here is a snippet of what i was doing

configure {
        request.uri = 'https://anypoint.mulesoft.com'
        request.contentType = JSON[0]
        request.encoder(MULTIPART_FORMDATA[0], ApacheEncoders.&multipart)
    }
    .post {
        request.uri.path = '/cloudhub/api/v2/applications'
        request.headers['X-ANYPNT-ENV-ID'] = eid
        request.contentType = MULTIPART_FORMDATA[0]
        request.body = multipart {
            part('appInfoJson', JSON[0], '{"domain":"myDomain"}')
            part('autoStart', 'true')
            part(
                    'file',
                    'myLargeZip.zip',
                    BINARY[0], // or 'application/zip'
                    new File('/parent', 'myLargeZip.zip')
            )
        }
    }