Allow more characters in header values #68
Merged
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The RFC says we should reject any header value that contains control
characters. But apparently in the real world, you have to both accept
and produce these sometimes (e.g. Google Analytics cookies use them).
As a compromise, we now accept most control characters, but continue
to disallow NUL (\x00) and all whitespace (\t\n\r\f\v and space),
except that space and tab are allowed inside header values when
surrounded by non-whitespace characters.
Closes: gh-57, gh-58