Update Status Code (GoogleCloudPlatform#1914)

Author: averikitsch

appengine-java8/firebase-tictactoe/README.md

@@ -46,11 +46,14 @@ mvn appengine:run
 export GOOGLE_CLOUD_SDK_HOME=/path/to/google-cloud-sdk
 ```
 
+* If you see the error `Unauthorized request.`:
+    * Make sure you've set the environment variable [`GOOGLE_APPLICATION_CREDENTIALS`](https://cloud.google.com/docs/authentication/production#providing_credentials_to_your_application) with
+    your service account key.
+
 ## Contributing changes
 
 See [CONTRIBUTING.md](../../CONTRIBUTING.md).
 
 ## Licensing
 
 See [LICENSE](../../LICENSE).
-

appengine-java8/firebase-tictactoe/src/main/java/com/example/appengine/firetactoe/MoveServlet.java

@@ -42,7 +42,7 @@ public void doPost(HttpServletRequest request, HttpServletResponse response) thr
 
     int cell = new Integer(request.getParameter("cell"));
     if (!game.makeMove(cell, currentUserId)) {
-      response.sendError(HttpServletResponse.SC_FORBIDDEN);
+      response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
     } else {
       ofy.save().entity(game).now();
     }

appengine-java8/firebase-tictactoe/src/test/java/com/example/appengine/firetactoe/MoveServletTest.java

@@ -150,7 +150,7 @@ public LowLevelHttpResponse execute() throws IOException {
         .buildRequest(eq("PATCH"), Matchers.matches(FIREBASE_DB_URL + "/channels/[\\w-]+.json$"));
   }
 
-  @Ignore // TODO: this wasn't running, and I've turned it off.
+  @Test
   public void doPost_notMyTurn_move() throws Exception {
     // Insert a game
     Objectify ofy = ObjectifyService.ofy();