javascript - 错误 : Cannot find module './lib/mediaType' "(after successful login)

Question

我已经实现了包括用户注册/登录在内的小型应用程序，使用 Passport 和 Express 进行路由和 mongodb/node.js。

我没有使用 Facebook 或 Google 等的任何可选登录。代码已经 100% 正常工作。几周后检查发生了一些变化，成功登录后，console.log 和 MongoDB 窗口日志都验证了这一点

我确实收到以下错误:

Error: Cannot find module './lib/mediaType'" 

错误是响应 app.post('/login) 中的 res.redirect 行而发生的。请参阅下面的相关代码。

当我评论这一行和 console.log 时没有问题

完整错误信息:

successful login authentication

module.js:540
throw err;
^

Error: Cannot find module './lib/mediaType'
    at Function.Module._resolveFilename (module.js:538:15)
    at Function.Module._load (module.js:468:25)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)

    at loadModule (D:\GitHub\js_exmpls\authentication\node_modules\negotiator\index.js:114:16)

    at Negotiator.mediaTypes (D:\GitHub\js_exmpls\authentication\node_modules\negotiator\index.js:76:29)

    at Accepts.type.Accepts.types (D:\GitHub\js_exmpls\authentication\node_modules\accepts\index.js:105:33)

    at IncomingMessage.req.accepts (D:\GitHub\js_exmpls\authentication\node_modules\express\lib\request.js:134:23)

    at ServerResponse.res.format (D:\GitHub\js_exmpls\authentication\node_modules\express\lib\response.js:627:11)

    at ServerResponse.redirect (D:\GitHub\js_exmpls\authentication\node_modules\express\lib\response.js:888:8)

    at D:\GitHub\js_exmpls\authentication\app.js:113:6

    at D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\middleware\authenticate.js:249:29

    at D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\http\request.js:51:48

    at D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\sessionmanager.js:16:14

    at pass (D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\authenticator.js:297:14)

    at Authenticator.serializeUser (D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\authenticator.js:299:5)

    at SessionManager.logIn (D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\sessionmanager.js:14:8)

    at IncomingMessage.req.login.req.logIn (D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\http\request.js
:50:33)

    at Strategy.strategy.success (D:\GitHub\js_exmpls\authentication\node_modules\passport\lib\middleware\authenticate.j
s:248:13)

    at verified (D:\GitHub\js_exmpls\authentication\node_modules\passport-local\lib\strategy.js:83:10)

    at PBKDF2.ondone (D:\GitHub\js_exmpls\authentication\node_modules\passport-local-mongoose\lib\authenticate.js:48:12))

我已经安装了媒体类型库并在我的 app.js 中添加了以下行:

"var mediaType = require('media-type');"

结果是错误消息没有变化。错误发生在响应 app.post('/login) 内的 res.redirect 行。请参阅下面的相关代码: 当我评论这一行并且只是 console.log 时没有问题。

代码:

var http = require('http');

var mongoose = require('mongoose');

var mongodb=require('mongodb'); 

var express=require('express');

var csv = require('csv');

var bodyParser= require('body-parser');

var fs = require('fs');

var path=require('path');

var assert= require('assert');

var User= require("./models/user.js");

var passport= require('passport');

var mediaType = require('media-type');

var LocalStrategy= require('passport-local');

var passportLocalMongoose= require('passport-local-mongoose');

var mongoClient=require('mongoose');

var app = express();

var Schema = mongoose.Schema;

.

.

 app.get('/login', function (req, res) {

 res.render('login' );

})
.

.


app.post("/login",function(req,res,err){

    if (err) {console.log(err); };//else not needed render is end

    passport.authenticate("local")(req,res,function(){

       console.log("successful login authentication");

    res.redirect("./views/friends.ejs");

    });

    })

Answer 1

只是复制this comment作为答案，因为它对 OP 和我都有效:

he problem comes from the module negotiator that is used by one of your modules

npm uninstall negotiator
npm install negotiator