remove wraning for intelliJ

Project: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/commit/4c18c38a
Tree: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/tree/4c18c38a
Diff: http://git-wip-us.apache.org/repos/asf/incubator-s2graph/diff/4c18c38a

Branch: refs/heads/master
Commit: 4c18c38ae072b4f2a2853fc62814779ccf818647
Parents: a3e1e39
Author: daewon <dae...@apache.org>
Authored: Fri Apr 6 14:26:09 2018 +0900
Committer: daewon <dae...@apache.org>
Committed: Fri Apr 6 14:26:09 2018 +0900

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 .../src/main/scala/org/apache/s2graph/graphql/HttpServer.scala   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/incubator-s2graph/blob/4c18c38a/s2graphql/src/main/scala/org/apache/s2graph/graphql/HttpServer.scala
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diff --git 
a/s2graphql/src/main/scala/org/apache/s2graph/graphql/HttpServer.scala 
b/s2graphql/src/main/scala/org/apache/s2graph/graphql/HttpServer.scala
index 26bce34..685e87b 100644
--- a/s2graphql/src/main/scala/org/apache/s2graph/graphql/HttpServer.scala
+++ b/s2graphql/src/main/scala/org/apache/s2graph/graphql/HttpServer.scala
@@ -22,9 +22,11 @@ package org.apache.s2graph.graphql
 import akka.actor.ActorSystem
 import akka.http.scaladsl.Http
 import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
+import akka.http.scaladsl.model.{HttpRequest, HttpResponse}
 import akka.http.scaladsl.server.Directives._
 import akka.http.scaladsl.server._
 import akka.stream.ActorMaterializer
+import akka.stream.scaladsl.Flow
 import org.slf4j.LoggerFactory
 
 import scala.concurrent.Await
@@ -40,7 +42,7 @@ object Server extends App {
 
   import scala.concurrent.duration._
 
-  val route = (post & path("graphql")) {
+  val route: Flow[HttpRequest, HttpResponse, Any] = (post & path("graphql")) {
     entity(as[spray.json.JsValue])(GraphQLServer.endpoint)
   } ~ {
     getFromResource("assets/graphiql.html")

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