From 7d2394d4ee63adf39a53ffd57b7c06cc67e21d96 Mon Sep 17 00:00:00 2001
From: Ufuk Celebi <uce@apache.org>
Date: Wed, 9 Dec 2015 16:36:35 +0100
Subject: [PATCH] [FLINK-2769] [runtime-web] Set allow-origin header

Many browsers don't allow cross-origin HTTP requests if the respective
HTTP header is not set by the server.

Because of this it was not possible to test changes to the web frontend
with the local proxy server and a running job manager.

See here: https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
---
 .../apache/flink/runtime/webmonitor/RuntimeMonitorHandler.java   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/RuntimeMonitorHandler.java b/flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/RuntimeMonitorHandler.java
index e174463b874..e5815c7cf18 100644
--- a/flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/RuntimeMonitorHandler.java
+++ b/flink-runtime-web/src/main/java/org/apache/flink/runtime/webmonitor/RuntimeMonitorHandler.java
@@ -119,6 +119,7 @@ public class RuntimeMonitorHandler extends SimpleChannelInboundHandler<Routed> {
 			response = new DefaultFullHttpResponse(
 					HttpVersion.HTTP_1_1, HttpResponseStatus.OK, Unpooled.wrappedBuffer(bytes));
 
+			response.headers().set(HttpHeaders.Names.ACCESS_CONTROL_ALLOW_ORIGIN, "*");
 			response.headers().set(HttpHeaders.Names.CONTENT_TYPE, contentType);
 		}
 		catch (NotFoundException e) {
-- 
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