AkousaHTTP Status CodesError
520520 Web Server Returned an Unknown Error
Cloudflare received an unexpected or empty response from the origin server.
browserserver
View details 421The request was directed at a server that is not able to produce a response for the combination of scheme and authority in the request URI.
The server received a request intended for a different server. This commonly happens with HTTP/2 connection coalescing where a single TLS connection serves multiple domains, but one domain cannot handle the request.
Retry the request, which will usually force a new connection to the correct server. If persistent, check your DNS and TLS certificate configuration for the target domain.
520Cloudflare received an unexpected or empty response from the origin server.
304The resource has not been modified since the last request, so the client can use its cached copy.
423The resource being accessed is locked and cannot be modified (WebDAV).
510The server requires further extensions to the request in order to fulfill it.
401The request requires user authentication. The client must provide valid credentials to access the resource.
524Cloudflare established a TCP connection but the origin server did not respond with an HTTP response in time.