You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: network.go
    path of file: ./repos/sliver/vendor/github.com/tailscale/goupnp
    
    the code of the file until where you have to start completion: package goupnp

import (
	"net"

	"github.com/tailscale/goupnp/httpu"
)

// httpuClient creates a HTTPU client that multiplexes to all multicast-capable
// IPv4 addresses on the host. Returns a function to clean up once the client is
// no longer required.
func httpuClient() (*httpu.MultiClient, erro
    
func httpuClient() (*httpu.MultiClient, error) {
	addrs, err := localIPv4MCastAddrs()
	if err != nil {
		return nil, ctxError(err, "requesting host IPv4 addresses")
	}

	delegates := make([]httpu.ClientInterface, 0, len(addrs))
	for _, addr := range addrs {
		c, err := httpu.NewHTTPUClientAddr(addr)
		if err != nil {
			return nil, ctxErrorf(err, "creating HTTPU client for address %s", addr)
		}
		delegates = append(delegates, c)
	}

	return httpu.NewMultiClient(delegates), nil
}