gptkb:500_Internal_Server_Error
200 OK
201 Created
204 No Content
301 Moved Permanently
302 Found
304 Not Modified
400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
405 Method Not Allowed
502 Bad Gateway
503 Service Unavailable
408 Request Timeout
418 I'm a teapot
429 Too Many Requests
451 Unavailable For Legal Reasons