Handle malformed redirect URLs in HTTP checks#2119
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Malformed redirect URLs can raise urllib3 LocationParseError after retry, bypassing callers that handle requests.RequestException. Convert persistent LocationParseError to requests InvalidURL and cover the retry path with a regression test.
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A persistent malformed redirect such as
https://./currently leaks urllib3'sLocationParseError, bypassing callers that handlerequests.RequestExceptionand aborting checks such as IPv4/IPv6 content comparison. Normalize it to Requests'InvalidURLafter the existing retry, with a focused regression test for the retry path.Fixes #2032.