我正在嘗試返回 JSON 以通過 passportjs 成功進行身份驗證，但我收到“錯誤在將標頭發送到客戶端后無法設置標頭”。

Question

在注冊用戶並對其進行身份驗證后，我正在嘗試發送 JSON 文件。 鑒權后回調function也在運行，但是拋出如下錯誤。 請幫忙！

這是 controller function：

 var passport = require("passport"); var connection = require("../config/dataBase"); var User = connection.models.User; const signUp = (req, res) => { User.register( { username: req.body.username, data: { firstName: req.body.firstName, lastName: req.body.lastName, }, }, req.body.password, function (err, user) { if (err) { console.log(err); } else { console.log("1"); passport.authenticate("local", { failureRedirect: "/login", failureMessage: true, }), (function (err, usr) { console.log("Registered and Authenticated"); return res.json({ authenticated: true, status: { message: "Successfully Signed up and authenticated", code: 200, }, }); })(req, res); } } ); res.end(); }; module.exports = signUp;

這是完整的錯誤：

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at new NodeError (node:internal/errors:372:5)
at ServerResponse.setHeader (node:_http_outgoing:576:11)
at ServerResponse.header (/home/pristyncare/Documents/MERN-Blog/Server/node_modules/express/lib/response.js:767:10)
at ServerResponse.json (/home/pristyncare/Documents/MERN-Blog/Server/node_modules/express/lib/response.js:264:10)
at /home/pristyncare/Documents/MERN-Blog/Server/controllers/signupController.js:26:24
at /home/pristyncare/Documents/MERN-Blog/Server/controllers/signupController.js:33:13
at /home/pristyncare/Documents/MERN-Blog/Server/node_modules/passport-local-mongoose/index.js:247:30
at processTicksAndRejections (node:internal/process/task_queues:96:5) {

代碼：'ERR_HTTP_HEADERS_SENT'}

Answer 1

我的錯，我發送了兩次回復。 只需要在代碼段末尾刪除 res.end() 部分就可以了。