Question about isOnline() DNS check behavior when using HTTP proxy

Hi,

First of all, thank you for maintaining this extension.

I have a question about the implementation of `isOnline()` in
WebRequestWorkerSingleton.

As far as I understand, `isOnline()` performs a DNS lookup against
`www.microsoft.com` to determine whether the machine is online.

I was wondering how this is expected to behave in environments where
an HTTP proxy is configured.

In many enterprise networks:

- The client machine does not resolve external DNS directly
- DNS resolution is performed by the proxy server
- HTTP/HTTPS traffic works correctly via the proxy
- But direct DNS lookups from the client may fail

In such a setup, DNS resolution failure does not necessarily mean
that the machine is offline.

So I was curious:

- Is the DNS lookup intentionally used as a simplified connectivity check?
- Is proxy-based DNS resolution considered out of scope?
- Would it make sense to instead attempt a lightweight HTTP request
using the configured proxy settings?

I may be misunderstanding the design intention, so I would appreciate
any clarification on this.

Thank you!