How to add values to an HTTP query string in Go

package main

import (
    "fmt"
    "net/http"
)

func main() {
    // create a request
    req, _ := http.NewRequest(http.MethodGet, "http://www.example.com/", nil)

    // get the current query string from the http.Request
    values := req.URL.Query()

    // add or set values
    values.Set("myKey1", "myVal1") // overwrite!
    values.Add("myKey1", "myVal2") // append!

    // add values back to the request
    req.URL.RawQuery = values.Encode() // query string: mykey1=myVal1&myKey1=myVal2

    // print the url
    fmt.Println(req.URL.String())
}