HTTP response codes
The most commonly seen HTTP response codes and their meanings. See Wikipedia for a comprehensive list.
2xx codes are considered successful responses and are shown in green unless this is unexpected, for example, because the domain has a web traffic forwarding page value, in which case, they will be shown in red.
200
200 (OK) is the standard success response returned when the resource is found.
3xx redirection codes are shown in green when the redirection is expected, for example, because it's to the web traffic forwarding page. Otherwise, they are shown in orange.
302
301 (Moved Permanently) means the resource has been permanently moved to a new URL. This code will be returned if you have a web traffic forwarding URL set for the domain.
302
302 (Found) means the resource has been found, but traffic is temporarily being redirected to another resource.
4xx client error codes indicate the request was incorrect or cannot be fulfilled by the server and are always shown in red.
400
400 (Bad Request) means the request was bad (malformed) and the server couldn't understand it. This code shouldn't ever appear on Dimpl.
401
401 (Unauthorized) means authenticaion (username/password) is required to access the resource and this wasn't provided.
403
403 (Forbidden) means access to the resource is denied.
404
404 (Not Found) means the requested resource could not be found (doesn't exist) on the server.
5xx server error codes indicate the server experienced an error processing the request and are always shown in red.
500
500 (Internal Server Error) is a generic error that indicates something went wrong, but there's no more specific error code to describe what it was.
502
502 (Bad Gateway) means the server received an invalid response from an upstream server. This might be shown when, for example, there was an error with a database server the page depends on.
503
503 (Service Unavailable) means the server is temporarily down or otherwise unable to respond, e.g. because it's overloaded.
504
503 (Gateway Timeout) means an upstream server, for example, a database server, the request depends on didn't respond in time.