Docker hub build error

[llun (Maythee Anegboonlap)]

I stuck getting new docker image from docker hub. All builds are stuck at this error

Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

[johnzheng]

Add proxy in your Dockerfile

…
FROM debian:jessie
ENV http_proxy http://web-proxy.corp.xxxxxx.com:8080/
ENV https_proxy https://web-proxy.corp.xxxxxx.com:8080/
…