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 (C:\github\V2\node_modules\express\lib\response.js:794:10)
at ServerResponse.send (C:\github\V2\node_modules\express\lib\response.js:174:12)
at C:\github\V2\app\API\register.js:84:13
at C:\github\V2\node_modules\mongodb\lib\utils.js:371:9
at C:\github\V2\node_modules\mongodb\lib\cursor\abstract_cursor.js:260:32
at C:\github\V2\node_modules\mongodb\lib\cursor\abstract_cursor.js:510:55
at C:\github\V2\node_modules\mongodb\lib\utils.js:371:9
at C:\github\V2\node_modules\mongodb\lib\sessions.js:136:24 {
code: 'ERR_HTTP_HEADERS_SENT'
這是我的檔案中導致問題的代碼。
const express = require('express');
const app = express();
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb srv://web:U*****[email protected]/";
const cookisSession = require('cookie-session');
const bodyParser = require('body-parser');
const session = require('express-session');
const mongodbsession = require('connect-mongodb-session')(session);
const cookieParser = require('cookie-parser');
const { response } = require('../database');
app.use(bodyParser.urlencoded({ extended: false })); // ??????????? body-parser
app.use(session({
secret: 'Session-service',
resave: false, // ???????????????????????
saveUninitialized: false, // ???????????????????????
maxAge: 1000 * 60 * 60 * 24 * 7, // ???????????????????????????????????????????????????????
store: new mongodbsession({
uri: 'mongodb srv://web:U******[email protected]/',
dbName: 'webjs',
collection: 'sessions'
})
}));
app.post('/a-login', (req, res) => {
const username = req.body.username;
const password = req.body.password;
// ???????? password
const hash = require('crypto').createHash('sha256');
hash.update(password);
const password_hash = hash.digest('hex');
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var dbo = db.db("webjs");
dbo.collection("users").find({ name: username, password: password_hash }).toArray(function(err, result) {
if (err) throw err;
if (result. Length > 0) {
res.send("??????????????? " username);
} else {
res.send("????????????????????????????????");
}
db.close();
} );
} );
if (result.length > 0) {
// ??????????? session
req.session.username = username;
req.session.gemd = result[0].gemd;
req.session.email = result[0].email;
req.session.id = result[0]._id;
req.session.save();
} else {
res.send("??????????????????????");
}
} );
module. Exports = app;
我應該如何解決這個問題？
這段文字由谷歌翻譯。
uj5u.com熱心網友回復：
res.send()編輯某些內容后，您無法修改會話（因為它會發送標頭） 。
此外，由于 Mongo 連接的東西是異步的，你不能有一個ifafter 塊并期望它正常作業。
像下面這樣的東西可能更接近你想要的，但我建議重構一些東西來使用async/ await。此外，絕對不要使用 sha256 進行密碼散列。
app.post("/a-login", (req, res) => {
MongoClient.connect(url, function (err, db) {
if (err) throw err;
const { username, password } = req.body;
// ???????? password
const hash = require("crypto").createHash("sha256");
hash.update(password);
const password_hash = hash.digest("hex");
db.db("webjs")
.collection("users")
.find({ name: username, password: password_hash })
.toArray(function (err, result) {
if (err) throw err;
if (result.length > 0) {
// ??????????? session
req.session.username = username;
req.session.gemd = result[0].gemd;
req.session.email = result[0].email;
req.session.id = result[0]._id;
req.session.save();
res.send("??????????????? " username);
} else {
res.send("????????????????????????????????");
}
db.close();
});
});
});
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