This is an archived snapshot of W3C's public bugzilla bug tracker, decommissioned in April 2019. Please see the home page for more details.
When the resource under test returns a 406, the mobileOK Checker only says that the tests could not be run because the resource under tests could not be retrieved. A 406 may for instance be returned because of the specific HTTP headers sent by the mobileOK Checker, and actually browsing the page with a regular browser may well return a 200 in that case, which is really confusing for users. The status code that was received should be displayed to help authors understand what happened.