As documented in the API page,
http_proxy=IP:PORT is used to specify a proxy.
Ideally your organisation uses a transparent proxy where this configuration is not necessary.
In the video above I demonstrate typically how you would configure Webconverger with a proxy server. However a potential problem is if you boot from an install version your proxy might not allow direct access to https://config.webconverger.com/, meaning you won't get your proxy configuration applied.
In this case you need to hold the Alt or Shift keys to get a
boot: prompt to
pass the appropriate
http_proxy= line, as mentioned on the debug page.
Again ideally your network can be configured to always allow access to
https://config.webconverger.com/, so that special network configurations like
a proxy server can be retrieved successfully and applied.