This appears to be a regression.

This can be reproduced by going to ci.blueocean.io/blue in safari, or running a master build from mvn hpi:run - if you click on any pipeline you get a 404 error screen (the pretty one).

When logged in locally, I saw this error from the api:

{
    "message" : "JWT token not found",
    "code" : 401,
    "errors" : [ ]
}

When not logged in. and trying to open a pipeline on ci.blueocean.io - I saw the same thing.

Seems JWT token related.