Can you help me find 10 differences between "web servers"?

Question

Computer networks

Hello.
Background.
I needed to write tests for one application.
The application is a crash reporter. It grabs a dump from the disk and sends it to the given url.
Inside the crash reporter, as I understand it, is a standard crashpad .
I wrote the test using the standard class from chromium EmbeddedTestServer ( link )
In fact, the whole test is a call to the EmbeddedTestServer::InitializeAndListen method + code that returns html (there is a standard stuffing from socket+bind+listen+accept+recv+send inside) .

Next, I opened the browser, made sure that the server is visible at 127.0.0.1:8080
I launched the crash reporter and .... it does not see the server.
OK. I took node js, wrote a primitive http server on it ( like this ). Launched, and made sure that the server is visible both from the browser and from the crash reporter.

And now I'm tormented by the question: how the hell? After all, in fact, in both cases there is a certain listening socket, which (after connecting) starts to give html.
But when this socket is wrapped in chromium code, and running in a separate process, it is "visible" only from the browser. And when the socket lives inside node js, it is suddenly visible from the crash reporter too.
Why??

I have only one guess: the crash reporter uses winhttp to work, and the normal browser, apparently, winsock. But when using a local server, this probably doesn't matter. Again, node js works great in both cases.
What other differences can these two "servers" have?