code: func (c *Controller) PathParamsExample(ctx *gin.Context) {
  	groupID, err := strconv.Atoi(ctx.Param("group_id"))
  	if err != nil {
  		httputil.NewError(ctx, http.StatusBadRequest, err)
  		return
  	}
  	accountID, err := strconv.Atoi(ctx.Param("account_id"))
  	if err != nil {
  		httputil.NewError(ctx, http.StatusBadRequest, err)
  		return
  	}
  	ctx.String(http.StatusOK, "group_id=%d account_id=%d", groupID, accountID)
  }
docs: // PathParamsExample godoc
  // @Summary path params example
  // @Description path params
  // @Tags example
  // @Accept json
  // @Produce json
  // @Param group_id path int true "Group ID"
  // @Param account_id path int true "Account ID"
  // @Success 200 {string} string "answer"
  // @Failure 400 {string} string "ok"
  // @Failure 404 {string} string "ok"
  // @Failure 500 {string} string "ok"
  // @Router /examples/groups/{group_id}/accounts/{account_id} [get]