Play Framework: Handle URL trailing slash with Application Global

Global.scala

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

object Global extends GlobalSettings {

    override def onHandlerNotFound(request: RequestHeader): Result = {

        // handle trailing slashes
        if (request.path.endsWith("/")) {
            // construct a new URI without the slash
            // request.path doesn't contain query strings
            // request.uri contains both the path and the query string
            val uri = request.path.take(request.path.length - 1) + {
                if (request.path == request.uri) "" // no query string
                else request.uri.substring(request.path.length)
            }

            Results.MovedPermanently(uri)
        }
        else // not my business. push it back to super class
            super.onHandlerNotFound(request)
    }
}