code: func (c *Context) GetQuery(key string) (string, bool) {
  	if values, ok := c.GetQueryArray(key); ok {
  		return values[0], ok
  	}
  	return "", false
  }
docs: // GetQuery is like Query(), it returns the keyed url query value
  // if it exists `(value, true)` (even when the value is an empty string),
  // otherwise it returns `("", false)`.
  // It is shortcut for `c.Request.URL.Query().Get(key)`
  //     GET /?name=Manu&lastname=
  //     ("Manu", true) == c.GetQuery("name")
  //     ("", false) == c.GetQuery("id")
  //     ("", true) == c.GetQuery("lastname")