RnetCookieAdapter stores cookies by domain, path and name and sends path, secure and a leading-dot domain to rnet. It also takes server-rotated values, and worker children and track sessions get the cookies with their paths.
Check a sequential download against the complete length whenever one is known, and settle the unknown-total case on the 416. An empty body of unknown length, a 206 with no complete length, and a 206 starting past the resume offset all passed the size checks before and were renamed into place. Four restart paths spent no attempt, so a host that always answered the same way cycled forever.
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