節點 JS 錯誤：錯誤 [ERR_HTTP_HEADERS_SENT]：將標頭發送到客戶端后無法設置標頭

Question

我正在嘗試在我的應用程序中實施身份驗證。 但是，應用在注冊用戶時拋出 cannot set header 錯誤。 我無法理解為什么通過錯誤處理 function“wrapAsync”會拋出此錯誤。

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
    at new NodeError (node:internal/errors:387:5)
    at ServerResponse.setHeader (node:_http_outgoing:603:11)
    at ServerResponse.header (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:794:10)
    at ServerResponse.send (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:174:12)
    at done (/Users/alisha/Desktop/Oshi/node_modules/express/lib/response.js:1035:10)
    at /Users/alisha/Desktop/Oshi/node_modules/ejs-mate/lib/index.js:356:7
    at tryHandleCache (/Users/alisha/Desktop/Oshi/node_modules/ejs/lib/ejs.js:280:5)
    at Object.exports.renderFile (/Users/alisha/Desktop/Oshi/node_modules/ejs/lib/ejs.js:491:10)
    at View.renderFile [as engine] (/Users/alisha/Desktop/Oshi/node_modules/ejs-mate/lib/index.js:298:7)
    at View.render (/Users/alisha/Desktop/Oshi/node_modules/express/lib/view.js:135:8)

這是我的代碼塊：

1. /注冊路線：

router.post('/register', wrapAsync(async(req,res)=>{
    const {username, email, nearestLocation, phoneNum, password, RePassword}= req.body;
    if(password !== RePassword) {
        req.flash('error', 'Please retype same password for confirmation')
        return res.redirect('/firm/register')
    }
    
        const hashpw= await bcrypt.hash(password, 12);
        const registerBusiness= new Businesses({
            username: username, email: email, location: nearestLocation, phoneNum: phoneNum,   password: hashpw})
        await registerBusiness.save();
        req.session.currentAccount= registerBusiness.id;
        req.session.currentAccountName = registerBusiness.username;
        req.flash('success', 'Successfully registered your Business account')
        return res.redirect('/home')
}))

2. wrapAsync模塊：

module.exports = (fn)=>{
    return ((req,res,next)=>{
        fn(req,res,next).catch(next)
    })
}

誰能向我解釋這個錯誤。

我期待這段代碼為請求發送一個響應。 但是，情況似乎並非如此，我也無法確定第二個響應是如何發送的。 幫我找答案...

Answer 1

這是我這邊的一個非常簡單的錯誤。 我現在想通了這個問題。 router.get 和 router.post 路由都在發送對相同 /register 請求的響應。