head

Matches requests with HTTP method HEAD.

Signature

def head: Directive0

Description

This directive filters the incoming request by its HTTP method. Only requests with method HEAD are passed on to the inner route. All others are rejected with a MethodRejectionMethodRejection, which is translated into a 405 Method Not Allowed response by the default RejectionHandler.

Note

Akka HTTP can handle HEAD requests transparently by dispatching a GET request to the handler and stripping off the result body. See the akka.http.server.transparent-head-requests setting for how to enable this behavior.

Example

Scala

sourceval route = head { complete("This is a HEAD request.") }

// tests:
Head("/") ~> route ~> check {
  responseAs[String] shouldEqual "This is a HEAD request."
}

Java

sourceimport static akka.http.javadsl.server.Directives.complete;
import static akka.http.javadsl.server.Directives.head;

final Route route = head(() -> complete("This is a HEAD request."));

testRoute(route).run(HttpRequest.HEAD("/")).assertEntity(
    "This is a HEAD request.");