[release/1.5] Fix WWW-Authenticate parsing #7132
Merged
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According to RFC 9110, quoted-string could be "".
https://datatracker.ietf.org/doc/html/rfc9110#section-11.6.1
https://datatracker.ietf.org/doc/html/rfc9110#appendix-A
Fixes #6376.
Signed-off-by: Kazuyoshi Kato [email protected]
(cherry picked from commit 548c9c3)