Revert "connection: close" change for long polling (#18758)

This reverts commit 79c8c696c09b0a7cbe1f1863e6c7c165b2f5f19f

Change-Id: I364bc4a77cff36f319cec86a793806a0406f78b4

1 files changed, 3 insertions, 9 deletions

diff --git a/server/src/com/vaadin/server/communication/PushHandler.java b/server/src/com/vaadin/server/communication/PushHandler.java
index 483c0abc44..0b4fe28b77 100644
--- a/server/src/com/vaadin/server/communication/PushHandler.java
+++ b/server/src/com/vaadin/server/communication/PushHandler.java
@@ -81,18 +81,12 @@ public class PushHandler {
             resource.getResponse().setContentType("text/plain; charset=UTF-8");
 
             VaadinSession session = ui.getSession();
-            if (resource.transport() == TRANSPORT.STREAMING
-                    || resource.transport() == TRANSPORT.LONG_POLLING) {
-                // Must ensure that the streaming/long-polling response contains
+            if (resource.transport() == TRANSPORT.STREAMING) {
+                // Must ensure that the streaming response contains
                 // "Connection: close", otherwise iOS 6 will wait for the
                 // response to this request before sending another request to
                 // the same server (as it will apparently try to reuse the same
-                // connection).
-
-                // Other browsers might also try to re-use the same
-                // connection for fetching static files after refreshing, which
-                // will cause a failure in loading vaadinPush.js or
-                // vaadinBootstrap.js
+                // connection)
                 resource.getResponse().addHeader("Connection", "close");
             }