Support unix sockets

[silverwind]

Along the lines of "features node-fetch doesn't intend to include" would be support for fetching from unix sockets. For the URL format, one option is to support the same format got supports like

http://unix:/var/run/docker.sock:/containers/json

[zkochan]

Until this is not supported in make-fetch-happen you may use a fork of node-fetch. node-fetch-unix adds unix sockets support to node fetch