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private def renderTpl(response: HttpServletResponse, tplPath: String, transformer: Transformer) = {
  val doc = transformer(loadTpl(tplPath))
  val html = doc.map(Html5.toString).mkString
  response.setContentType("text/html; charset=utf-8")
  response.getWriter.println("<!doctype html>", html)
}

private def loadTpl(path: String) = {
  val parserFactory = new org.ccil.cowan.tagsoup.jaxp.SAXFactoryImpl
  val adapter = new scala.xml.parsing.NoBindingFactoryAdapter
  val tpl = getClass.getResourceAsStream(path)
  val source = new org.xml.sax.InputSource(tpl)
  val parser = parserFactory.newSAXParser
  adapter.loadXML(source, parser)
}