func (u URLParams) Encode() string {
	return url.Values(u).Encode()
}
Encode encodes the values into ``URL encoded'' form
("bar=baz&foo=quux") sorted by key.
package gensupport
import "net/url"
type URLParams map[string][]string
func (u URLParams) Set(key, value string) {
	u[key] = []string{value}
}
func (u URLParams) SetMulti(key string, values []string) {
	u[key] = values
}