Blue ocean is not able to load the steps for piplines that use a branch name convention of "feature/foo" (ie git branch type of things).

It results in a 404:

jenkins-js-extension.js:14924 GET http://localhost:8080/jenkins/blue/rest/organizations/jenkins/pipelines/multi2/branches/feature/newhotness/runs/1/nodes/9/steps 404 (Not Found)

as you can see, it is prematurely escaping the URL, or something?

To reproduce:

1) setup https://github.com/cloudbeers/blueocean-demo-project as a multibranch github project
2) let them run
3) try to open the feature/newhotness branch