code: func (c *Client) RequestForm(verb, p string, i interface{}, ro *RequestOptions) (*http.Response, error) {
  	if ro == nil {
  		ro = new(RequestOptions)
  	}
  
  	if ro.Headers == nil {
  		ro.Headers = make(map[string]string)
  	}
  	ro.Headers["Content-Type"] = "application/x-www-form-urlencoded"
  
  	buf := new(bytes.Buffer)
  	if err := form.NewEncoder(buf).KeepZeros(true).DelimitWith('|').Encode(i); err != nil {
  		return nil, err
  	}
  	body := buf.String()
  
  	ro.Body = strings.NewReader(body)
  	ro.BodyLength = int64(len(body))
  
  	return c.Request(verb, p, ro)
  }
docs: // RequestForm makes an HTTP request with the given interface being encoded as
  // form data.