I don't think the reason phrase is optional, even though it can be just
a whitespace.
Even if I'm not mistaken, however, I don't see the reason for Guile not
to be able to parse the status line without a space at the end.
Aside from that consider a string "HTTP/1.1 ", which should be a bad
response because the status code should definitely be obligatory,
however it passes through the (and d0 d1) check after applying this
patch.
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