akka-http: How to set response headers

Question

I\'ve a route as follows:

val route = {
    logRequestResult(\"user-service\") {
      pathPrefix(\"user\") {
        get {
          respondWithHeader(RawHeader         


        

Answer 1

I found this one post that says "In spray/akka-http some headers are treated specially". Apparently, content type is one of those and hence can't be set as in my code above. One has to instead create an HttpEntity with the desired content type and response body. With that knowledge, when I changed the get directive as follows, it worked.

import akka.http.scaladsl.model.HttpEntity
import akka.http.scaladsl.model.MediaTypes.`application/json`

get {
  parameters("firstName".?, "lastName".?).as(Name) { name =>
    findUserByName(name) match {
      case Left(users) => complete(users)
      case Right(error) => complete(error._1, HttpEntity(`application/json`, error._2))
    }
  }
}