What does the Android emulator "proxy settings" mean?

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I'm probably missing something pretty obvious.

I'm trying to make my Flutter app to be able to access localhost:3000 on my local machine. In another thread someone said I should replace it by 10.0.2.2:3000. It still doesn't work as my app tries to connect to 10.0.2.2:[RANDOM_PORT]

Now I'm trying to understand Android Emulator proxy settings..

On my Android settings I see Host name and Port number but I have no idea what it means. Shouldn't a Proxy proxy requests to HOST:PORT to ANOTHER_HOST:ANOTHER_PORT? How come I don't have the concept of if you go here, actually go there

What does host name and port number mean here?

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