func (u *URI) FullURI() []byte {
	u.fullURI = u.AppendBytes(u.fullURI[:0])
	return u.fullURI
}
func (u *URI) FullURI() []byte {
	u.fullURI = u.AppendBytes(u.fullURI[:0])
	return u.fullURI
}
// FullURI returns full uri in the form {Scheme}://{Host}{RequestURI}#{Hash}.