I am using the grafana plugin with Hawkular on OCP. If we *dont* set the CORS allowed value to all, then the grafana plugin gets AJAX errors due to CORS. As shown by some simple cURL commands below. Hawkular CORS set to: http://test.com **/counters/stats examples:* Fails due to Origin mismatch but still returns data - didn't expect to get data back if a 400 is returned... not sure if thats a bug or not. localhost:hawkular-client-java garethah$ curl -u admin:admin --header "Hawkular-Tenant: unit-testing" --request GET " http://192.168.99.100:8080/hawkular/metrics/counters/stats?bucketDuration... --header "Origin: http://bob.com" -vvv * Trying 192.168.99.100... * Connected to 192.168.99.100 (127.0.0.1) port 8080 (#0) * Server auth using Basic with user 'admin' /hawkular/metrics/counters/stats?bucketDuration=1d&percentiles=90.0&metrics=noofzsny&stacked=true HTTP/1.1 < HTTP/1.1 400 Bad Request < Expires: 0 < Cache-Control: no-cache, no-store, must-revalidate < X-Powered-By: Undertow/1 < Server: WildFly/10 < Pragma: no-cache < Date: Mon, 05 Dec 2016 17:25:22 GMT < Connection: keep-alive < Content-Type: application/json < Content-Length: 217 < * Connection #0 to host 192.168.99.100 left intact [{"start":1480929922811,"end":1481016322811,"min":-5.3461447394508227E18,"avg":1.13394506239459277E18,"median":1.41820444399757005E18,"max":6.5335287915888394E18,"sum":1.1339450623945933E19,"samples":1,"empty":false}] Working example with correctly returned Access-Control-Allow-Origin: localhost:hawkular-client-java garethah$ curl -u admin:admin --header "Hawkular-Tenant: unit-testing" --request GET " http://192.168.99.100:8080/hawkular/metrics/counters/stats?bucketDuration... --header "Origin: http://test.com" -vvv * Trying 192.168.99.100... * Connected to 192.168.99.100 (127.0.0.1) port 8080 (#0) * Server auth using Basic with user 'admin' /hawkular/metrics/counters/stats?bucketDuration=1d&percentiles=90.0&metrics=noofzsny&stacked=true HTTP/1.1 < HTTP/1.1 200 OK < Expires: 0 < Cache-Control: no-cache, no-store, must-revalidate < X-Powered-By: Undertow/1 < Access-Control-Allow-Headers: origin,accept,content-type,hawkular-tenant < Server: WildFly/10 < Pragma: no-cache < Date: Mon, 05 Dec 2016 17:26:13 GMT < Connection: keep-alive < Access-Control-Allow-Origin: http://test.com < Access-Control-Allow-Credentials: true < Content-Type: application/json < Content-Length: 217 < Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS, HEAD < Access-Control-Max-Age: 259200 < * Connection #0 to host 192.168.99.100 left intact [{"start":1480929973847,"end":1481016373847,"min":-5.3461447394508227E18,"avg":1.13394506239459277E18,"median":1.41820444399757005E18,"max":6.5335287915888394E18,"sum":1.1339450623945933E19,"samples":1,"empty":false}] **/counters/raw/query examples:* Gets data but doesn't return any Access-Control-Allow-Origin headers thus will fail in grafana. localhost:hawkular-client-java garethah$ curl -u admin:admin --header "Hawkular-Tenant: unit-testing" --request POST " http://192.168.99.100:8080/hawkular/metrics/counters/raw/query" --data "{order:\"ASC\",ids:[\"noofzsny\"]}" --header "Content-Type: application/json" --header "Origin: http://test.com" -vvv * Trying 192.168.99.100... * Connected to 192.168.99.100 (127.0.0.1) port 8080 (#0) * Server auth using Basic with user 'admin' * upload completely sent off: 30 out of 30 bytes < HTTP/1.1 200 OK < Expires: 0 < Cache-Control: no-cache, no-store, must-revalidate < X-Powered-By: Undertow/1 < Server: WildFly/10 < Pragma: no-cache < Date: Mon, 05 Dec 2016 17:30:38 GMT < Connection: keep-alive < Content-Type: application/json < Content-Length: 590 < * Connection #0 to host 192.168.99.100 left intact [{"id":"noofzsny","data":[{"timestamp":1480943333446,"value":-5346144739450823145},{"timestamp":1480943363446,"value":5257714416350875295},{"timestamp":1480943393446,"value":4269323419475977241},{"timestamp":1480943423446,"value":4996234959867023108},{"timestamp":1480943453446,"value":-4477830536950343320},{"timestamp":1480943483446,"value":3744561193794180662},{"timestamp":1480943513446,"value":-3619119654582223963},{"timestamp":1480943543446,"value":6533528791588839899},{"timestamp":1480943573446,"value":225819548751014015},{"timestamp":1480943603446,"value":-244636774898588607}]}] Have i missed something in the grafana / hawkular setup? or is this a bug? Cheers.