Can't install from npm with proxy although proxy is configed in .npmrc

Question

I'm trying to install some lib using npm. I use proxy and I configed proxy for npm. This is my .npmrc file:

timeout=100000
registry=http://registry.npmjs.org/
https-proxy=https://192.168.43.1:8080/
proxy=http://192.168.43.1:8080/
strict-ssl=false

I have tried all solution at Is there a way to make npm install (the command) to work behind proxy?. But not work for me.

I'm using Ubuntu 20.04.

Thanks.