VSCode WSL-2 Proxy Problem: Failed to establish a socket connection to proxies

Problem Description

When I was using Node.js and generated the file package.jons, I found there's a warning at the start:

Problems loading reference 'https://json.schemastore.org/package': Unable to load schema from 'https://json.schemastore.org/package': Failed to establish a socket connection to proxies: ["SOCKS5 127.0.0.1:1090","SOCKS 127.0.0.1:1090"].

Possible Reason

Then I searched the error message Failed to establish a socket connection to proxies, and found maybe it's a wsl2 proxy problem according to this github reply.

For more precise reason, I searched the VSCode proxy document metioned by the reply, and found maybe it's caused by wrong proxy setting.

Ways to try

According to the VSCode document, I want to try the setting of "Manual proxy address". But I encountered two problems:

1. I don't know how to run the command line mentioned in the VSCode document: --proxy-server=<scheme>=<uri>[:<port>][;...] | <uri>[:<port>] | "direct://".
2. I don't know where to find the file /etc/resolv.conf mentioned in the github reply to get the wsl server ip.