Example of streaming text data to client in Scala on Play Framework 2.1 using OutputStream. It took me a long time to figure out how to get this working, so in case it helps someone else, here it is. The >>> Enumerator.eof is very important other wise it hangs

gistfile1.scala

  def index = Action {
    val output = Enumerator.outputStream
    {
      o =>
        val out = new PrintWriter(new OutputStreamWriter(o, "utf8"), true)
        for(i <- 1 to 5)
        {
            out.println(s"Hello $i")
        }
        out.close()
    }

    Ok.stream(output >>> Enumerator.eof).withHeaders(
            "Content-Type"->"text/plain; charset=utf-8"
        )
  }