Unable to setup upstream proxy

[zero-master]

I passed this as params to the client constructor.

client = Client(PROXY_SERVER_ENDPOINT, params={'httpProxy': '172.17.0.12:5566', 'httpsProxy': '172.17.0.12:5566' })
Here is what I see in the logs:

[WARN 2017-08-24T15:11:27,676 net.lightbody.bmp.BrowserMobProxyServerLegacyAdapter] (qtp2053628870-18) Chained proxy support through setOptions is deprecated. Use setUpstreamProxy() to enable chained proxy support.
Connect timeouts from the configured browsermobproxy proxy.