Hi, I agree that it is not a complient http response, but unfortunately I came across with some http services (redfish, cimc from Cisco ), where they don't put a reason phrase. As you can see the difference is that response line doesn't have a space after the response code, that is why it raise an exception even though the documentation says 'and the (possibly empty) "reason phrase"'.
I would call it as a follow up to f53145d41. -- Alexey
