Why does spray-can server not respond to a http request? - scala

Question

I'm trying to set a very basic HTTP server using spray-can. If I call the endpoint I've set a mapping for, I'm getting a timeout (although using a debugger I can see that the actor receives the message).
My source looks like this:
import akka.actor.{Actor, ActorRef, ActorSystem, Props}
import akka.io.IO
import spray.can.Http
import spray.http.{HttpMethods, HttpRequest, HttpResponse, Uri}
class App extends Actor {
implicit val system = context.system
override def receive = {
case "start" =>
val listener: ActorRef = system.actorOf(Props[HttpListener])
IO(Http) ! Http.Bind(listener, interface = "localhost", port = 8080)
}
}
class HttpListener extends Actor {
def receive = {
case _: Http.Connected =>
sender() ! Http.Register(self)
case HttpRequest(HttpMethods.GET, Uri.Path("/ping"), _, _, _) =>
HttpResponse(entity = "PONG")
}
}
object Main {
def main(args: Array[String]) {
val system = ActorSystem("my-actor-system")
val app: ActorRef = system.actorOf(Props[App], "app")
app ! "start"
}
}
Executing run shows:
> run
[info] Running Main
[INFO] [09/10/2014 21:33:38.839] [my-actor-system-akka.actor.default-dispatcher-3] [akka://my-actor-system/user/IO-HTTP/listener-0] Bound to localhost/127.0.0.1:8080
The following HTTP/1.1 500 Internal Server Error shows up when I hit http://localhost:8080/ping:
➜ ~ curl --include http://localhost:8080/ping
HTTP/1.1 500 Internal Server Error
Server: spray-can/1.3.1
Date: Wed, 10 Sep 2014 19:34:08 GMT
Content-Type: text/plain; charset=UTF-8
Connection: close
Content-Length: 111
Ooops! The server was not able to produce a timely response to your request.
Please try again in a short while!
My build.sbt looks like:
scalaVersion := "2.11.2"
resolvers += "spray repo" at "http://repo.spray.io"
libraryDependencies ++= Seq(
"io.spray" %% "spray-can" % "1.3.1",
"io.spray" %% "spray-routing" % "1.3.1",
"com.typesafe.akka" %% "akka-actor" % "2.3.5"
)
Any ideas on what I'm doing wrong?

Answer 1

case HttpRequest(HttpMethods.GET, Uri.Path("/ping"), _, _, _) =>
HttpResponse(entity = "PONG")
should be
case HttpRequest(HttpMethods.GET, Uri.Path("/ping"), _, _, _) =>
sender ! HttpResponse(entity = "PONG")
You are returning HttpResponse instead of sending a message to the sender.