Seeing same issue here - Blue Ocean shows a white screen on Ms Edge

blueocean 1.19.0
sse-gateway 1.20

This issue is reproduced :

MS edge:

Microsoft Edge 41.16299.1480.0

Microsoft EdgeHTML 16.16299

BlueOcean:
1.21.0 · Core 2.190.1 

SSE Gateway:

1.20

found the culprit in building see-gateway

the file in the source tree is a link

ls -lrt src/main/resources/org/jenkinsci/plugins/ssegateway/sse/EventSource.js lrwxr-xr-x 1 olamy staff 77 13 Feb 19:45 src/main/resources/org/jenkinsci/plugins/ssegateway/sse/EventSource.js -> ../../../../../../../../node_modules/event-source-polyfill/eventsource.min.jsdifferent result

there is a difference when copying resources in 2.7 and >=3.0.0

maven-resources-plugin:2.7:resources

ls -lrt target/classes/org/jenkinsci/plugins/ssegateway/sse/

rw-r-r- 1 olamy staff 5226 13 Feb 21:04 target/classes/org/jenkinsci/plugins/ssegateway/sse/EventSource.js

maven-resources-plugin:3.1.0:resources

ls -lrt target/classes/org/jenkinsci/plugins/ssegateway/sse/total 0lrwxr-xr-x 1 olamy staff 77 13 Feb 21:01 EventSource.js -> ../../../../../../../../node_modules/event-source-polyfill/eventsource.min.js

with 2.7 version of the plugin the file is copied as a file and not as a link as done by version >=3.0.0

Is it https://issues.apache.org/jira/browse/MRESOURCES-237?

Liam Newman yes

ps ready for review https://github.com/jenkinsci/sse-gateway-plugin/pull/46

sse-gateway plugin 1.21 released.