Streaming a binary file in Scala Play 2.4.5

streaming.scala

import java.io.FileInputStream
import java.nio.file.Paths
import play.api.http.HttpEntity

import akka.stream.scaladsl.StreamConverters
import play.api.mvc._
import play.api.http.MimeTypes._
import play.api.http.HeaderNames._
import play.api.http.Status._


val path = Paths.get("asdf")
val file = path.toFile
val contentLength = file.length
val stream: FileInputStream = new FileInputStream(file)
val source = StreamConverters.fromInputStream(() => stream)

Result(
  header = ResponseHeader(OK, Map(
    CONTENT_TYPE -> BINARY,
    CONTENT_LENGTH -> contentLength.toString,
    CONNECTION -> "keep-alive"
  )),
  body = HttpEntity.Streamed(source, Some(contentLength), Some(BINARY))
)