Cannot set headers after they are sent to the client

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Cannot set headers after they are sent to the client

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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”)

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1回答

双越

2021-08-11

解决就好😄

0

2

双越

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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

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