code: func (r *Request) Prefix(segments ...string) *Request {
  	if r.err != nil {
  		return r
  	}
  	r.pathPrefix = path.Join(r.pathPrefix, path.Join(segments...))
  	return r
  }
docs: // Prefix adds segments to the relative beginning to the request path. These
  // items will be placed before the optional Namespace, Resource, or Name sections.
  // Setting AbsPath will clear any previously set Prefix segments