From 2b4da0f558aaec4f44334ea59367a95da67a53b3 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 23 Feb 2026 13:07:40 +0000
Subject: [PATCH 1/3] Initial plan


From 15c2767bd2d860333fd521934dd7adf998f9068f Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Mon, 23 Feb 2026 13:11:39 +0000
Subject: [PATCH 2/3] Copy akka-http PR #4219: Add
 toFunctionPassThroughExceptions to RouteTest

Co-authored-by: pjfanning <11783444+pjfanning@users.noreply.github.com>
---
 .../http/scaladsl/testkit/RouteTest.scala     | 21 ++++++++++++++++---
 .../pekko/http/scaladsl/server/Route.scala    |  2 +-
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala b/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
index 2bbde91bd..f37d51d9d 100644
--- a/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
+++ b/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
@@ -20,7 +20,7 @@ import scala.reflect.ClassTag
 import scala.util.DynamicVariable
 
 import org.apache.pekko
-import pekko.actor.ActorSystem
+import pekko.actor.{ ActorSystem, ClassicActorSystemProvider }
 import pekko.http.scaladsl.Http
 import pekko.http.scaladsl.client.RequestBuilding
 import pekko.http.scaladsl.model._
@@ -224,8 +224,23 @@ trait RouteTest extends RequestBuilding with WSTestRequestBuilding with RouteTes
       }
   }
 }
-private[http] object RouteTest {
-  def runRouteClientServer(request: HttpRequest, route: Route, serverSettings: ServerSettings)(
+object RouteTest {
+
+  /**
+   * Turn the route into a function for testing, but do not handle exceptions in any way, instead, they are bubbled
+   * out as is to the caller.
+   */
+  def toFunctionPassThroughExceptions(route: Route)(
+      implicit system: ClassicActorSystemProvider): HttpRequest => Future[HttpResponse] = {
+    val routingLog = RoutingLog(system.classicSystem.log)
+    val routingSettings = RoutingSettings(system)
+    val parserSettings = ParserSettings.forServer
+    implicit val ec: ExecutionContextExecutor = system.classicSystem.dispatcher
+    implicit val mat: Materializer = SystemMaterializer(system).materializer
+    Route.createAsyncHandler(route, routingLog, routingSettings, parserSettings)
+  }
+
+  private[http] def runRouteClientServer(request: HttpRequest, route: Route, serverSettings: ServerSettings)(
       implicit system: ActorSystem): Future[HttpResponse] = {
     import system.dispatcher
     for {
diff --git a/http/src/main/scala/org/apache/pekko/http/scaladsl/server/Route.scala b/http/src/main/scala/org/apache/pekko/http/scaladsl/server/Route.scala
index cbacfdea0..bbd20d423 100644
--- a/http/src/main/scala/org/apache/pekko/http/scaladsl/server/Route.scala
+++ b/http/src/main/scala/org/apache/pekko/http/scaladsl/server/Route.scala
@@ -85,7 +85,7 @@ object Route {
       SystemMaterializer(system).materializer)
   }
 
-  private def createAsyncHandler(sealedRoute: Route, routingLog: RoutingLog, routingSettings: RoutingSettings,
+  private[pekko] def createAsyncHandler(sealedRoute: Route, routingLog: RoutingLog, routingSettings: RoutingSettings,
       parserSettings: ParserSettings)(
       implicit ec: ExecutionContextExecutor, mat: Materializer): HttpRequest => Future[HttpResponse] = {
     request =>

From b54fcbfccdbcb8a238ed1c0337e670bafb6504e6 Mon Sep 17 00:00:00 2001
From: PJ Fanning <pjfanning@users.noreply.github.com>
Date: Thu, 26 Feb 2026 13:26:50 +0100
Subject: [PATCH 3/3] Document toFunctionPassThroughExceptions with @since

Add @since annotation to toFunctionPassThroughExceptions method.
---
 .../scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala | 1 +
 1 file changed, 1 insertion(+)

diff --git a/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala b/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
index f37d51d9d..4ed18506c 100644
--- a/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
+++ b/http-testkit/src/main/scala/org/apache/pekko/http/scaladsl/testkit/RouteTest.scala
@@ -229,6 +229,7 @@ object RouteTest {
   /**
    * Turn the route into a function for testing, but do not handle exceptions in any way, instead, they are bubbled
    * out as is to the caller.
+   * @since 1.4.0
    */
   def toFunctionPassThroughExceptions(route: Route)(
       implicit system: ClassicActorSystemProvider): HttpRequest => Future[HttpResponse] = {