code: func (c *Client) MakeRequest(ctx context.Context, method string, pathPart string, data url.Values, v interface{}) error {
  	if !strings.HasPrefix(pathPart, "/"+c.APIVersion) {
  		pathPart = c.FullPath(pathPart)
  	}
  	rb := new(strings.Reader)
  	if data != nil && (method == "POST" || method == "PUT") {
  		rb = strings.NewReader(data.Encode())
  	}
  	if method == "GET" && data != nil {
  		pathPart = pathPart + "?" + data.Encode()
  	}
  	req, err := c.NewRequest(method, pathPart, rb)
  	if err != nil {
  		return err
  	}
  	req = withContext(req, ctx)
  	if ua := req.Header.Get("User-Agent"); ua == "" {
  		req.Header.Set("User-Agent", userAgent)
  	} else {
  		req.Header.Set("User-Agent", userAgent+" "+ua)
  	}
  	return c.Do(req, &v)
  }
docs: // Make a request to the Twilio API.