req.scala

private def request(charset: String)(f: => HttpUriRequest): Try[String] = Try {
  val c = clientBuilder.build()
  try {
    val res = c.execute(f)
    try {
      EntityUtils.toString(res.getEntity, charset)
    } finally {
      HttpClientUtils.closeQuietly(res)
    }
  } finally {
    HttpClientUtils.closeQuietly(c)
  }
}