Headers were already written Wanted to override status code 400 with 200

[GIN-debug] [WARNING] Headers were already written. Wanted to override status code 400 with 200

前言

环境: Golang

框架: gin

发生条件: 返回

经过

我简单封装了一个response方法

func (ac *ApiController) Response(ctx *gin.Context, httpCode, errCode int, data gin.H) {
	msg := codemsg.GetMsgByCode(errCode)
	if data == nil {
		ctx.JSON(httpCode, gin.H{
			"code":    errCode,
			"message": msg,
			"data":    struct{}{},
		})
	} else {
		ctx.JSON(httpCode, gin.H{
			"code":    errCode,
			"message": msg,
			"data":    data,
		})
	}

	logger.GetLogger().Info(ctx, "method", "API Response", "code", errCode, "errMsg", msg)
	ctx.Abort()
	return
}

当我接受参数时

	var param dto.StartParam
	err := ctx.BindJson(&param)
	if err != nil {
		logger.GetLogger().Error(ctx, "method", method, "err", err)
		c.Response(ctx, http.StatusOK, codemsg.DecodeInformGetParamFail, nil)
		return
	}

然后报错了

trace_id=f5db2a1d-3754-4480-b630-e64e51cae0df method=[ReconciliationController.Start] err=EOF [GIN-debug] [WARNING] Headers were already written. Wanted to override status code 400 with 200

错误理由很简单,我response重写了请求头的响应码

但是我不想修改http的响应码

看下 BindJson源码就知道了

// BindJSON is a shortcut for c.MustBindWith(obj, binding.JSON).
func (c *Context) BindJSON(obj interface{}) error {
	return c.MustBindWith(obj, binding.JSON)
}

MustBindWith 方法源码

// MustBindWith binds the passed struct pointer using the specified binding engine.
// It will abort the request with HTTP 400 if any error occurs.
// See the binding package.
func (c *Context) MustBindWith(obj interface{}, b binding.Binding) error {
	if err := c.ShouldBindWith(obj, b); err != nil {
		c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck
		return err
	}
	return nil
}

c.AbortWithError(http.StatusBadRequest, err).SetType(ErrorTypeBind) // nolint: errcheck

搁这呢!

已经设置了错误码,abort 是中断请求流程,这个是中断请求流程并设置错误码

解决办法

BindJson –> ShouldBind

换个方法使用即可

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