Cannot set headers after they are sent to the client

首页课程实战体系课手记专栏慕课教程

Cannot set headers after they are sent to the client

来源：7-3 cookie用于登录验证

可达鸭_

2021-08-11

跟着老师一点一点敲得，找不到哪里 res.end()了一次啊
![ 图片描述

解决不了错误

解决了。。。前面不能
res.writeHead(200, {
“Access-Control-Allow-Origin”: “",
“Content-Type”: “application/json;charser=utf-8”
})
要改成
res.setHeader(“Access-Control-Allow-Origin”,"”)
res.setHeader(“Content-Type”,“application/json;charser=utf-8”)

写回答

1回答

双越

2021-08-11

解决就好😄

0

2

双越

回复

可达鸭_

因为你 wirteHead 就直接返回了。相当于先 setHeader 再 res.end()

2021-08-12

共2条回复

Node.js+Express+Koa2+Nest.js 开发服务端

从入门到实战，一站式掌握 Node.js+Express+Koa2

4078 学习 · 2013 问题

相似问题

报错：Cannot set headers after they are sent to the client

回答 1

接上个问题，报错：Cannot set headers after they are sent to the client

回答 1

login 报出这个错误Error: Can't set headers after they are sent.

回答 2

Cannot set headers after they are sent to the client

回答 1

设置seCookie时报错Cannot set headers after they are sent to the client

回答 1

打开慕课网App查看更多内容