Reduce flakiness in io.opentelemetry.javaagent.instrumentation.playmvc.v2_4.server.PlayServerTest.successfulGetRequest(int)[3]

Automated fix attempt based on Develocity flaky-test analysis.

Author: trask

instrumentation/play/play-mvc/play-mvc-2.4/javaagent/src/play24Test/java/io/opentelemetry/javaagent/instrumentation/playmvc/v2_4/server/PlayServerTest.java

@@ -47,7 +47,10 @@ protected Server setupServer() {
             .routeTo(
                 () ->
                     controller(
-                        SUCCESS, () -> Results.status(SUCCESS.getStatus(), SUCCESS.getBody())))
+                        SUCCESS,
+                        () ->
+                            closeConnection(
+                                Results.status(SUCCESS.getStatus(), SUCCESS.getBody()))))
             .GET(INDEXED_CHILD.getPath())
             .routeTo(
                 () ->
@@ -103,6 +106,17 @@ protected Server setupServer() {
     return Server.forRouter(router.build(), port);
   }
 
+  private static Results.Status closeConnection(Results.Status javaResult) {
+    Tuple2<String, String> header = new Tuple2<>("Connection", "close");
+    return new Results.Status(
+        javaResult
+            .toScala()
+            .withHeaders(
+                JavaConverters.asScalaIteratorConverter(singletonList(header).iterator())
+                    .asScala()
+                    .toSeq()));
+  }
+
   @Override
   protected void stopServer(Server server) {
     server.stop();