curl: urlapi: CURLUPART_HOST accepts text after an IPv6 zone ip and URL round trip changes the host

Summary: six or fewer sentences describing the issue in your own human voice and optionally a short proof-of-concept script An app can set a host from untrusted input from CURLUPARTHOST, as the docs allow, and rely on curl to reject bad hosts. curl accepts fe80::1%[email protected]/x as a valid...