▶️ Client should show "Pass" as error message
Next - 6x (CLIENT CERTIFICATE REQUIRED)
Status codes beginning with 5 are PERMANENT FAILURE status codes, meaning:
The request has failed. There is no response body. The nature of the failure is permanent, i.e. identical future requests will reliably fail for the same reason. The contents of <META> may provide additional information on the failure, and should be displayed to human users. Automatic clients such as aggregators or indexing crawlers should not repeat this request.