SSE - filters are not picked up, works for normal endpoints

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote
  resource at http://127.0.0.1:8080/ee8-sample-sse/resources/beats.
  (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

 rsvoboda  rs  ~  git  rsvoboda-playground  ee8-sample-sse  webapp  master  $  curl -vvv http://localhost:8080/ee8-sample-sse/resources/foo
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET /ee8-sample-sse/resources/foo HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.53.1
> Accept: */*
> 
< HTTP/1.1 200 OK
< X-Powered-By: Undertow/1
< Access-Control-Allow-Headers: origin, content-type, accept, authorization, ETag, if-none-match
< Server: WildFly/10
< Access-Control-Expose-Headers: origin, content-type, accept, authorization, ETag, if-none-match
< Date: Mon, 23 Oct 2017 12:49:25 GMT
< Connection: keep-alive
< Access-Control-Allow-Origin: *
< x-foo-by: rs
< Access-Control-Allow-Credentials: true
< Content-Type: application/json
< Content-Length: 33
< Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS, HEAD
< Access-Control-Max-Age: 1209600
< 
* Connection #0 to host localhost left intact
{"key1":"value1","key2":"value2"} 

curl -vvv -i http://localhost:8080/ee8-sample-sse/resources/beats
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET /ee8-sample-sse/resources/beats HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.53.1
> Accept: */*
> 
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Connection: keep-alive
Connection: keep-alive
< X-Powered-By: Undertow/1
X-Powered-By: Undertow/1
< Server: WildFly/10
Server: WildFly/10
< Transfer-Encoding: chunked
Transfer-Encoding: chunked
< Content-Type: text/event-stream
Content-Type: text/event-stream
< Date: Mon, 23 Oct 2017 12:49:27 GMT
Date: Mon, 23 Oct 2017 12:49:27 GMT