Rails 5 NotFound error

[mvaragnat]

I used Workless for all my apps with rails 3.x or 4.x without issues; Thank you for this great gem.
Most recently I tried to use it with a Rails 5 app, failing with the following error :

Excon::Error::NotFound: Expected(200) <=> Actual(404 Not Found)
body: "The requested API endpoint was not found. Are you using the right HTTP verb (i.e. GET vs. POST), and did you specify your intended version with the Accept header?"

The background job is processed without issue if I don't have Workless and pay for an Heroku Worker instead.

Any idea?