bug#51133: [PATCH 1/1] Tolerate http response line without reason phrase

[jakub-w]

You're right but you didn't address my second point.
The fact that with this patch

(call-with-input-string "HTTP/1.1 \n"
  (lambda (port) (read-response-line port)))

passes the check for 'bad-response error inside read-response-line. It
throws 'bad-header-component from non-negative-integer instead because
d1 is always true if d0 is true.