More proxy improvements #20
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goproxy doesn't hang up the upstream connection when the downstream connection closes. So, it'll read in the next request and then fail to send it downstream. In this case it 502's. It would be nicer if it could close the upstream connection preemtively so the cient could re-dial. Elixir's HTTPoison tries pooling requests over the CONNECT tunnel and this results in 502's bubbling up to the calling app. Setting `Connection: close` prevents this pooling.
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CONNECTtunnelsConnection: closeon responses to prevent multiple requests from transitingCONNECTtunnels.