Unofficial HTTP status codes used for RESTful error responses

Code Text Description
103 Checkpoint Resume aborted PUT or POST requests
420 Method Failure A method has failed in the Spring Framework
420 Enhance Your Calm Used in the past by Twitter instead of the 429 Too Many Requests status
450 Blocked by Windows Parental Controls (Microsoft) (self-explanatory)
498 Invalid Token (Esri) Expired or invalid token in the ArcGIS for Server
499 Token Required (Esri) A token is required in the ArcGIS for Server
499 Request has been forbidden by antivirus A malicious site is intercepted by programs such as wget
509 Bandwidth Limit Exceeded The server has exceeded the bandwidth assigned to it (common for Apache Web Server/cPanel in shared hostings)
530 Site is frozen A Pantheon web platform site has been forzen due to inactivity
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