elixir-mint / mint / bc24618cb9d3b69dbf0ea7de537802f39bbb6f29

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Return a tunnel timeout error when the CONNECT deadline elapses (#495)

receive_response/3 recomputes the remaining timeout from the deadline on
every loop iteration and feeds it straight into the receive's after
clause. A proxy that keeps dribbling bytes of the CONNECT response until
the deadline passes mid-loop produces a negative timeout, which raises
ErlangError :timeout_value in the calling process instead of returning
{:error, %Mint.HTTPError{reason: {:proxy, :tunnel_timeout}}}. Clamp the
timeout to 0 so an elapsed deadline yields the documented error.

Also document the :tunnel_timeout option in the Proxying section; it was
previously only mentioned in the Mint.HTTPError docs.

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