Create a go proxy repo to https://proxy.golang.org
When a request is sent which gets a 410 from the remote, NXRM responds with 404 to the client instead.
The 410 status code has a distinct use case in go proxies, so it is important to mimic what the official repository does.
As the docs state, surfacing 410 to the client has a use case:
When resolving a package path to its containing module, the go command will try all candidate module paths on each proxy in the list in succession. An unreachable proxy or HTTP status code other than 404 or 410 terminates the search without consulting the remaining proxies.
Return 410 status code from NXRM when the remote returns 410 status code.