Displaying request headers in play2

Application.scala

package controllers

import play.api._
import play.api.mvc._

object Application extends Controller {
  
  def index = Action { request =>
    Ok(views.html.index(request))
  }
  
}

index.scala.html

@(request: play.api.mvc.Request[_])
@main("Play headers") {

    <h3>Headers</h3>
    <p>
      <table>
      <thead>
      <tr><th>Header</th><th>Value</th></tr>
      </thead>
      <tbody>
      @request.headers.keys.map { key =>
        <tr>
        <td>@key</td><td>@(request.headers.getAll(key).mkString("[", ", ", "]"))</td>
        </tr>
      }
      </tbody>
      </table>
      </ul>
    <p>
    
}