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package main

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

func main() {
	s := "postgres://user:pass@host.com:5432/path?k=v#f"
	u, err := url.Parse(s)
	if err != nil {
		panic(err)
	}

	fmt.Println(u.Scheme)

	fmt.Println(u.User)
	fmt.Println(u.User.Username())
	p, _ := u.User.Password()
	fmt.Println(p)

	fmt.Println(u.Host)
	host, port, _ := net.SplitHostPort(u.Host)
	fmt.Println(host)
	fmt.Println(port)

	fmt.Println(u.Path)
	fmt.Println(u.Fragment)

	fmt.Println(u.RawQuery)
	m, _ := url.ParseQuery(u.RawQuery)
	fmt.Println(m)
	fmt.Println(m["k"][0])
}
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$ go run url-parsing.go 
postgres
user:pass
user
pass
host.com:5432
host.com
5432
/path
f
k=v
map[k:[v]]
v
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