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Insert the HelloRetryRequest cookie among the permutable extensions - #3
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The cookie was spliced at Intn(len-2), a uniform index from zero, so about one retried handshake in the number of extensions put it ahead of the leading GREASE extension, which no browser does. On short lists the range collapsed and the cookie always went first. Pick the index between the first and last extension that is not GREASE, padding or pre_shared_key; the Chrome shuffle shares that predicate. Based on the HelloRetryRequest part of sardanioss/utls 356f21e.
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The cookie was spliced at Intn(len-2), a uniform index from zero, so about one
retried handshake in the number of extensions put it ahead of the leading
GREASE extension, which no browser does. On short lists the range collapsed
and the cookie always went first.
Pick the index between the first and last extension that is not GREASE,
padding or pre_shared_key; the Chrome shuffle shares that predicate.
Based on the HelloRetryRequest part of sardanioss/utls 356f21e.
Stacked on #1 (module path). Merge that first; GitHub then retargets this PR to
master.