support non-English content

[2efPer]

  @cask.get("/")
  def getNonEnglishContent1() = "조선글"

  @cask.get("/test1")
  def getNonEnglishContent2() = "سىناك"

  @cask.get("/test2")
  def getNonEnglishContent3() = "שלום"

Browser content of non-English character changes to a garbled message.

[2efPer]

I find two ways to solve this problem for now.
pass a HttpServerExchange parameter,

  @cask.get("/test1")
  def test1(exchange: HttpServerExchange) = {
    exchange.getResponseHeaders.put(new HttpString("Content-Type"),"text/plain; charset=utf-8")
    "سىناك"
  }

or implement a new cask.get annotation.

  class myGet(val path: String, override val subpath: Boolean = false) extends WebEndpoint{
    val methods = Seq("get")
    override def wrapFunction(ctx: Request, delegate: Delegate): Result[Raw] = {
      ctx.exchange.getResponseHeaders.put(new HttpString("Content-Type"),"text/plain; charset=utf-8")
      super.wrapFunction(ctx, delegate)
    }
  }

I think this function should be supported natively by cask.

[jodersky]

It looks like this can be traced back to geny's StringWritable, which is responsible for serializing strings and setting content-type headers. Since the serializer actually uses utf-8, it would make sense to add that to the content headers too. I think the change would be minimal, probably only this line.