[http/file_server] Show local network IP about deno_std HOT 4 CLOSED

@iuioiua Many other file serving tools do this. For example serve and vite dev both print the local network interface when starting up. I think we should also do this in when running deno run -A jsr:@std/http/file_server. It's a very trivial change for us, and it improves user experience. I think we should do it.

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No, I don't think so. This is particularly useful when running a development server like is common with the file_server tool

from deno_std.

This is a valid use case. However, finding and printing the network address of the current machine seems out of scope for std/http/file_server. The reason is that network interfaces vary across machines and OSs. Instead, I think we should provide an example in the documentation that shows how Deno.networkInterfaces() can be used with Deno.serve()'s onListen() option to print the current machine's network address. An annotation would have to be marked somewhere that determining the network address varies between machines and OSs.

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Okay, fair points. Would it be worth making this default onListen() behaviour for Deno.serve() instead?

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