\r\n only get the \n stripped, not the \r (unless it's the last header which
does get the \r stripped). Patch by Tony Meyer.
test_whitespace_continuation_last_header(),
test_strip_line_feed_and_carriage_return_in_headers(): New tests.
_parse_headers(): Be sure to strip \r\n from the right side of header lines.
parser must recognize outer boundaries in inner parts. So cruise through the
EOF stack backwards testing each predicate against the current line.
There's still some discussion about whether this is (always) the best thing to
do. Anthony would rather parse these messages as if the outer boundaries were
ignored. I think that's counter to the RFC, but might be practically more
useful. Can you say behavior flag? (ug).
message/delivery-status clause, and genericize it to handle all (other)
message/* content types. This lets us correctly parse 2 more of Anthony's
MIME torture tests (specifically, the message/external-body examples).
(standard) tests, and doesn't throw parse errors. I still need throw
Anthony's torture test at it, but I wanted to get this checked in and off my
disk.
