Summary of the new feature/enhancement

curl has the parameter --unix-socket which is super useful when dealing with those services which use them (like Docker). for example:

curl --unix-socket /var/run/docker.sock http://v1.40/images/json| convertfrom-json

It seems that our webrequest and restmethods should support this.

Proposed technical implementation details (optional)

One possible approach would be to allow the uri property to encode the path to the socket
It seems like the cmdlets have enough parameter sets, but adding parameter sets for this might also be reasonable.