🐛 [Bug]: Proxy middleware and Vite dev server on localhost, tcp4 127.0.0.1:5173: connect: connection refused about fiber HOT 6 CLOSED

I believe adding an option for DialDualStack won't hurt. As a fiber user, I'm forced to fork proxy middleware to enable it as my cloud provider only support IPv6 for internal networking.

I can contribute if needed.

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bug filed with upstream package valyala/fasthttp#1730

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Erik Dubbelboer from upstream issue:

This is because vite only listens on IPv6 and fasthttp doesn't try dialing IPv6 by default. If you change the code to this it works:

	client := fasthttp.Client{
		DialDualStack: true,
	}
	statusCode, body, err := client.Get(nil, "http://localhost:5173")

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Further ref for Vite/node: vitejs/vite#2032

https://nodejs.org/api/net.html#net_server_listen_options_callback

vitejs/vite#8543

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Should we support dual stack be default in the client for proxy middleware?

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@negrel Agree we should add an option to allow either ipv4, ipv6 or DialDual to the middleware. Sounds reasonable to me.

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