code: func (r *Response) TransferEncoding() string {
  	for _, h := range r.Headers {
  		if strings.EqualFold(h.Key, "Transfer-Encoding") {
  			switch h.Value {
  			case "identity", "chunked":
  				return h.Value
  			}
  		}
  	}
  	return "identity"
  }
docs: // TransferEncoding returns the transfer encoding this message was transmitted with.
  // If not is specified by the sender, "identity" is assumed.