code: func (x *Context) URLParam(key string) string {
  	for k := len(x.URLParams.Keys) - 1; k >= 0; k-- {
  		if x.URLParams.Keys[k] == key {
  			return x.URLParams.Values[k]
  		}
  	}
  	return ""
  }
docs: // URLParam returns the corresponding URL parameter value from the request
  // routing context.