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.
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