To start servers (jetty on 8080 and blaze on 8081) both serving the same routes:
sbt run
To test:
curl localhost:8080/pref-a/pref-b/test-resource
curl localhost:8081/pref-a/pref-b/test-resource
Expect both to return Ok(should be found).
In reality, blaze appears to work correctly but jetty returns InternalServerError(should not be found).