def scheme(name: String): Directive0


Rejects a request if its Uri scheme does not match a given one.

The scheme directive can be used to match requests by their Uri scheme, only passing through requests that match the specified scheme and rejecting all others.

A typical use case for the scheme directive would be to reject requests coming in over http instead of https, or to redirect such requests to the matching https URI with a MovedPermanently.

For simply extracting the scheme name, see the extractScheme directive.


import akka.http.scaladsl.model._
import akka.http.scaladsl.model.headers.Location
import StatusCodes.MovedPermanently

val route =
  scheme("http") {
    extract(_.request.uri) { uri =>
      redirect(uri.copy(scheme = "https"), MovedPermanently)
  } ~
    scheme("https") {
      complete(s"Safe and secure!")

// tests:
Get("") ~> route ~> check {
  status shouldEqual MovedPermanently
  header[Location] shouldEqual Some(Location(Uri("")))

Get("") ~> route ~> check {
  responseAs[String] shouldEqual "Safe and secure!"
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