fix: preserve absolute Windows sendFile paths - #606
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Summary
Preserve legitimate absolute Windows filesystem paths passed to
reply.sendFile()andreply.download()while retaining the backslash separator protection for URL pathnames.The previous hardening rejected every pathname containing
\, which caused absolute Windows paths such aspath.join(...)to return 403.Validation
node --test --test-name-pattern='serving disabled without root|does not serve static files with backslash separators|sendFile rejects non-canonical' test/static.test.jsnpm run lint -- --no-warn-ignored