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: local.go
    path of file: ./repos/ko/vendor/github.com/aws/aws-sdk-go-v2/config
    
    the code of the file until where you have to start completion: package config

import (
	"fmt"
	"net"
	"net/url"
)

var lookupHostFn = net.LookupHost

func isLoopbackHost(host string) (bool, error) {
	ip := net.ParseIP(host)
	if ip != nil {
		return ip.IsLoopback(), nil
	}

	// Host is not an ip, perform lookup
	addrs, err := lookupHostFn(host)
	if err != nil {
		return false, err
	}
	if len(addrs) == 0 {
		
    
func validateLocalURL(v string) error {
	u, err := url.Parse(v)
	if err != nil {
		return err
	}

	host := u.Hostname()
	if len(host) == 0 {
		return fmt.Errorf("unable to parse host from local HTTP cred provider URL")
	} else if isLoopback, err := isLoopbackHost(host); err != nil {
		return fmt.Errorf("failed to resolve host %q, %v", host, err)
	} else if !isLoopback {
		return fmt.Errorf("invalid endpoint host, %q, only host resolving to loopback addresses are allowed", host)
	}

	return nil
}