handleRejections

Signature

def handleRejections(handler: RejectionHandler): Directive0

Description

Using this directive is an alternative to using a global implicitly defined RejectionHandler that applies to the complete route.

See Rejections for general information about options for handling rejections.

Example

Scala
Java
sourceval totallyMissingHandler = RejectionHandler.newBuilder()
  .handleNotFound { complete(StatusCodes.NotFound, "Oh man, what you are looking for is long gone.") }
  .handle { case ValidationRejection(msg, _) => complete(StatusCodes.InternalServerError, msg) }
  .result()
val route =
  pathPrefix("handled") {
    handleRejections(totallyMissingHandler) {
      path("existing")(complete("This path exists")) ~
      path("boom")(reject(new ValidationRejection("This didn't work.")))
    }
  }

// tests:
Get("/handled/existing") ~> route ~> check {
  responseAs[String] shouldEqual "This path exists"
}
Get("/missing") ~> Route.seal(route) /* applies default handler */ ~> check {
  status shouldEqual StatusCodes.NotFound
  responseAs[String] shouldEqual "The requested resource could not be found."
}
Get("/handled/missing") ~> route ~> check {
  status shouldEqual StatusCodes.NotFound
  responseAs[String] shouldEqual "Oh man, what you are looking for is long gone."
}
Get("/handled/boom") ~> route ~> check {
  status shouldEqual StatusCodes.InternalServerError
  responseAs[String] shouldEqual "This didn't work."
}
sourceimport org.apache.pekko.http.javadsl.server.Directives;

import static org.apache.pekko.http.javadsl.server.Directives.complete;
import static org.apache.pekko.http.javadsl.server.Directives.handleRejections;
import static org.apache.pekko.http.javadsl.server.Directives.pathPrefix;
import static org.apache.pekko.http.javadsl.server.Directives.reject;

final RejectionHandler totallyMissingHandler =
    RejectionHandler.newBuilder()
        .handleNotFound(
            complete(StatusCodes.NOT_FOUND, "Oh man, what you are looking for is long gone."))
        .handle(
            ValidationRejection.class,
            r -> complete(StatusCodes.INTERNAL_SERVER_ERROR, r.message()))
        .build();

final Route route =
    pathPrefix(
        "handled",
        () ->
            handleRejections(
                totallyMissingHandler,
                () ->
                    Directives.concat(
                        path("existing", () -> complete("This path exists")),
                        path(
                            "boom",
                            () ->
                                reject(Rejections.validationRejection("This didn't work."))))));

// tests:
testRoute(route).run(HttpRequest.GET("/handled/existing")).assertEntity("This path exists");
// applies default handler
testRoute(route)
    .run(HttpRequest.GET("/missing"))
    .assertStatusCode(StatusCodes.NOT_FOUND)
    .assertEntity("The requested resource could not be found.");
testRoute(route)
    .run(HttpRequest.GET("/handled/missing"))
    .assertStatusCode(StatusCodes.NOT_FOUND)
    .assertEntity("Oh man, what you are looking for is long gone.");
testRoute(route)
    .run(HttpRequest.GET("/handled/boom"))
    .assertStatusCode(StatusCodes.INTERNAL_SERVER_ERROR)
    .assertEntity("This didn't work.");
1.0.1