respondWithHeader and rejections

[Jelmer Kuperus]

In akka http I am using the respondWithHeader directive to add a correlation id to the response like so

final case class `X-Request-Id`(token: String) extends ModeledCustomHeader[`X-Request-Id`] {

  override def renderInRequests = true

  override def renderInResponses = true

  override val companion = `X-Request-Id`

  override def value: String = token

}

object `X-Request-Id` extends ModeledCustomHeaderCompanion[`X-Request-Id`] {

  override val name = "X-Request-Id"

  override def parse(value: String) = Try(new `X-Request-Id`(value))

}

respondWithHeader(`X-Request-Id`(requestId))

However it seems that on rejections this header is not added to the response. Is this a bug or am i missing something ?

[Jelmer Kuperus]

It seems that it works if instead of using the default  rejection handler i use an explicit rejection handler as an inner directive. 

respondWithHeader(`X-Request-Id`(requestId)) {

  handleRejections(RejectionHandler.default) {

    ...

But this is rather inconvenient because some headers are set deeply nested within the routes. Is there an better way?