Added 'proxy_http_version 1.1' header when connection is upgraded #50
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Proxied websocket connection requires http version 1.1. Without this clients trying connect to proxied websocket will receive
Handshake ended with HTTP error: 400
http://nginx.org/en/docs/http/websocket.html
https://developer.mozilla.org/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism