connection errors with loopback http2 upgrade

[kyessenov]

PR #100 fails in "a" -> "a" case:

kubectl exec -it a-3708111894-q8dx0 client http://a/a
-- error
kubectl exec -it a-3708111894-q8dx0 client http://b/a
-- works fine

Here the debug log from envoy:

[2017-02-08 18:06:58.109][17][info][main] [C16] new connection
[2017-02-08 18:06:58.110][17][info][client] [C17] connecting
[2017-02-08 18:06:58.111][17][info][client] [C17] protocol error: The user callback function failed
[2017-02-08T18:06:58.110Z] "GET /a HTTP/1.1" 503 UC 0 57 2 - "-" "Go-http-client/1.1" "06c8f613-0618-408f-9a62-230286b91d2c" "a" "tcp://10.0.0.114:8080"

[kyessenov]

@lizan @myidpt might be relevant to your issues with auto-upgrade to TLS