code: func (r *Resource) Res(options ...interface{}) *Resource {
  	if len(options) > 0 {
  		var url string
  		if len(r.Url) > 0 {
  			url = r.Url + "/" + options[0].(string)
  		} else {
  			url = options[0].(string)
  		}
  
  		header := r.Headers
  		if header == nil {
  			header = http.Header{}
  		}
  		newR := &Resource{Url: url, Api: r.Api, Headers: header}
  
  		if len(options) > 1 {
  			newR.Response = options[1]
  		}
  
  		return newR
  	}
  	return r
  }
docs: // Creates a new Resource.