The httpserver config would add some additional fields:
addr/address/listen would accept a path to a socket
Optional owner, group to set the chown on the socker
Optional chmod would set the mode
Assume the socket would be deleted when closed? There is also potentially some error returned when fcgi server terminates which needs to be dealt with.
Test the fastCGI socket option for go-server. Might need to add Owner, Group and Mode permissions and come up with a nginx.conf file