Currently, the scheduler library does not drop 404 Not Found but treats them as Event::ERROR. The library can receive this if the master has not yet set up HTTP routes yet. The executor library already deals with this.
Secondly, in some cases, the detector can detect a new master without the master realizing that it has been elected as the new master. In such cases, the master responds with 307 Temporary Redirect. We would like to drop these status codes too instead of treating them as Event::ERROR too.