66899f43_less_JavaScript_Error_Tracking__What_it_means
[Status Code] 420 [What it means] 
Chill Winston. You have hit the rate-limit. The server imposes a limit of 5000 requests/hour. If you exceed that limit, you will get this response for the rest of the hour.
HTTP API :: Errorception - Painless JavaScript Error Tracking
What it means