Scalatra Set Response Headers - scala

Question

I am trying to set response headers during post request. While everything compiles properly, headers are not set.
Here is my code:
post("/get_value"){
val jsonString = request.body;
response.setHeader("Access-Control-Allow-Origin", "*")
response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE")
response.setHeader("Access-Control-Max-Age", "3600")
response.setHeader("Access-Control-Allow-Headers", "x-requested-with, content-type")
jsonString
}
What is the valid way to set headers of this kind?
Thanks!

Answer 1

I'm not familiar with Scalatra but you can notice that ActionResult is a case class;
case class ActionResult(status: ResponseStatus, body: Any, headers: Map[String, String])
3rd parameter of this case class is Map[String,String] which should be response header.
There is also;
object Ok {
def apply(body: Any = Unit, headers: Map[String, String] = Map.empty, reason: String = "") = ActionResult(responseStatus(200, reason), body, headers)
}
Returns http response with status code 200, you can create it like;
Ok("response",Map('HeaderKey' -> 'HeaderValue'))
As a conclusion final solution can be like;
post("/get_value") {
val jsonString = request.body;
val headers = Map("Access-Control-Allow-Origin" -> "*",
"Access-Control-Allow-Methods" -> "POST, GET, OPTIONS, DELETE",
"Access-Control-Max-Age" -> "3600",
"Access-Control-Allow-Headers" -> "x-requested-with, content-type")
Ok(jsonString,headers)
}