sknebel[snarfed]: re HTTP 521, afaik they use a bunch of "52X" codes instead of "502" to signal more detailed information (upstream cant be found, rejects connections, times out, gives broken responses , has invalid TLS, ...)
sknebelbit "eh". realistically you cant really do varied things as a client on specific 5xx codes, so using made up ones doesnt really break anything and gives more info?
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