Why does npm give out 4 new lines after reinstalling?

Question

npm

Hello.
I reinstalled npm, everything works, everything loads, but I found new 4 lines, at the beginning of each command:
npm WARN invalid config https-proxy="..."
npm WARN invalid config Must be a full url with 'http://'
npm WARN invalid config https-proxy="..."
npm WARN invalid config Must be a full url with 'http://'
What do they mean?

Answer 1

npm config rm https-proxy