Clean up the system dns cache after dnsproxy starts successfully

[NPCDW]

I set up two dns addresses, primary dns: 127.0.0.1, and backup dns: 192.168.0.1.

After turning off dnsproxy, the backup dns worked.

When I reopened dnsproxy, some websites were cached by the backup dns , did not pass the main dns.

When I execute the ipconfig /flushdns command, the primary dns started to work.

Proceed as follows:

1. Close dnsproxy, then clear the system cache and open a new inprivate window and visit a website
2. Open dnsproxy a. do not clean up the system cache, and then open a new inprivate window b. clear the system cache, open a new inprivate window

[ameshkov]

I don't think this should be a part of dnsproxy functionality.

Every OS provides a way to clear DNS cache, you should use it in your own scripts.