func (m *Macaron) SetURLPrefix(prefix string) {
	m.urlPrefix = prefix
	m.hasURLPrefix = len(m.urlPrefix) > 0
}
func (m *Macaron) SetURLPrefix(prefix string) {
	m.urlPrefix = prefix
	m.hasURLPrefix = len(m.urlPrefix) > 0
}
func ( m * Macaron ) SetURLPrefix ( prefix string ) { m . urlPrefix = prefix m . hasURLPrefix = len ( m . urlPrefix ) > 0 }
// SetURLPrefix sets URL prefix of router layer, so that it support suburl.
SetURLPrefix sets URL prefix of router layer so that it support suburl .