code: func (t httpTransport) NewRequest(path string, data io.Reader) (*http.Request, error) {
  	req, err := newHTTPRequest(path, data)
  	if err != nil {
  		return nil, err
  	}
  	req.URL.Scheme = t.scheme
  	req.URL.Host = t.addr
  	return req, nil
  }
docs: // NewRequest creates a new http.Request and sets the URL
  // scheme and address with the transport's fields.