Cannot use external addresses for the http-proxy-middleware proxy function when behind a network proxy

Created by: thtliife

When I configure my dev environment to proxy api requests in the package.json proxy key, I am unable to make any requests when behind my network proxy.

If I join a network which does not require the use of a proxy, everything works fine.

From what I can tell, this issue is caused because the http-proxy-middleware module doesn't make use of the systems network proxy

Submitting a PR shortly to allow configuration of the network proxy agent option in http-proxy-middleware via the apps package.json