mapResponseEntity

Signature

def mapResponseEntity(f: ResponseEntity ⇒ ResponseEntity): Directive0

Description

The mapResponseEntity directive is used as a building block for Custom Directives to transform a response entity that was generated by the inner route.

See Response Transforming Directives for similar directives.

Example

def prefixEntity(entity: ResponseEntity): ResponseEntity = entity match {
  case HttpEntity.Strict(contentType, data) =>
    HttpEntity.Strict(contentType, ByteString("test") ++ data)
  case _ => throw new IllegalStateException("Unexpected entity type")
}

val prefixWithTest: Directive0 = mapResponseEntity(prefixEntity)
val route = prefixWithTest(complete("abc"))

// tests:
Get("/") ~> route ~> check {
  responseAs[String] shouldEqual "testabc"
}