Akka Http | Graph with feedback makes the response hang -


i using stream source in akka http route. stream uses graph has feedback loop in it. when try action using wget, hangs. if remove loop , make plain left right stream, response terminates expected. see both requests broadcast-2 in proxy client , there output in wget response, hangs although see expected output.

does know can causing this? actor "service" sends http xml request , transforms httpresponse. ive tried using connection pool , http.singlerequest, neither make difference, stream still hangs.

ive included graph below route.

//graph cycle def create(actor: actorref)(implicit log: loggingadapter,                                   executioncontext:   executioncontextexecutor,                                   system: akka.actor.actorsystem,                                   timeout: akka.util.timeout,                                   materializer: akka.stream.materializer) = graphdsl.create() { implicit builder =>   import graphdsl.implicits._   import akka.pattern.ask    val mergein = builder.add(merge[(int, boolean)](2))   val broadcast = builder.add(broadcast[either[int, nodeseq]](2))   //   val a3 = builder.add(flow[(int, boolean)].mapasync(1)(x => {     (actor ? x).mapto[either[int, nodeseq]]   }))    val e1 = builder.add(flow[either[int, nodeseq]].map(_.left.getorelse(-1) ).filter(_ > 0).map((_, false)))   val e2 = builder.add(flow[either[int, nodeseq]].map(_.right.getorelse(nodeseq.empty)))    val = builder.add(flow[int].map((_, true)))    ~> mergein ~> a3 ~> broadcast ~> e2   broadcast ~> e1   mergein <~ e1    flowshape(a.in, e2.out) }  ...  lazy val service = system.actorof(props(new apiservice), "extra-retriever") ... ...  // akka http route  val importpath = path("import") { {   complete {      import clientexport._     httpentity(contenttypes.`text/plain(utf-8)`,       source.fromfuture(future((1 3)))         .mapconcat(toimmutable)         .via(create(service))         .filternot(_.isempty).map(x => bytestring(s"${x.tostring}"))     )   } }

}


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