Npmrc file details

Hi
we are using nexus version 3.25.1 and we are in process of upgrade to 3.29.
currently for npmrc we are using setting as
registry=http://x.y.z.z:8081/repository/npm-virtual
_auth=“abcxyz==”
after upgrade to 3.29 we see this setting are not working

registry=http://x.y.z.z:8081/repository/npm-virtual
_auth=“abcxyz==”

and it is working with this setting.
registry=http://x.y.z.z:8081/repository/npm-virtual
//x.y.z.z:8081/repository/:_auth=“abcxyz==”

why we have to append. //x.y.z.z:8081/repository/ this

any thought will help.

Thanks
DJM

Npm changed the implementation of _auth at some point. Now it will only work against the npm registry unless it is prefixed with the repository URL as scope: