updated to UBI and get backend host from env

Student User

2019-08-01 f6dd9c426795696c6b1ba779a87e4e5b1f774836

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s/listen       80/listen       8080/
s/listen       \[::\]:80/listen       \[::\]:8080/
s/user nginx;//
s%error_log /var/log/nginx/error.log%error_log stderr%
s%access_log  /var/log/nginx/access.log  main;%%