无法准确地解读错误：TypeError：路径必须是绝对的或指定根目录res.sendFile在ServerResponse.sendFile

Question

我是一个react/redux/mongoose/passport noob。我认为它应该通过axios和反应页面发送回应，但看起来并非如此。

我得到这个奇怪的错误，类似于在this link发现的问题。

GET /robots.txt 500 6.666 ms - 2143 
TypeError: path must be absolute or specify root to res.sendFile 
at ServerResponse.sendFile (/Users/eric/Documents/todobuild/node_modules/express/lib/response.js:421:11) 
at /Users/eric/Documents/todobuild/server.js:40:12 
at Layer.handle [as handle_request] (/Users/eric/Documents/todobuild/node_modules/express/lib/router/layer.js:95:5) 
at next (/Users/eric/Documents/todobuild/node_modules/express/lib/router/route.js:137:13) 
at Route.dispatch (/Users/eric/Documents/todobuild/node_modules/express/lib/router/route.js:112:3) 
at Layer.handle [as handle_request] (/Users/eric/Documents/todobuild/node_modules/express/lib/router/layer.js:95:5) 
at /Users/eric/Documents/todobuild/node_modules/express/lib/router/index.js:281:22 
at param (/Users/eric/Documents/todobuild/node_modules/express/lib/router/index.js:354:14) 
at param (/Users/eric/Documents/todobuild/node_modules/express/lib/router/index.js:365:14) 
at Function.process_params (/Users/eric/Documents/todobuild/node_modules/express/lib/router/index.js:410:3) 
at next (/Users/eric/Documents/todobuild/node_modules/express/lib/router/index.js:275:10) 
at SessionStrategy.strategy.pass (/Users/eric/Documents/todobuild/node_modules/passport/lib/middleware/authenticate.js:338:9) 
at SessionStrategy.authenticate (/Users/eric/Documents/todobuild/node_modules/passport/lib/strategies/session.js:75:10) 
at attempt (/Users/eric/Documents/todobuild/node_modules/passport/lib/middleware/authenticate.js:361:16) 
at authenticate (/Users/eric/Documents/todobuild/node_modules/passport/lib/middleware/authenticate.js:362:7) 
at Layer.handle [as handle_request] (/Users/eric/Documents/todobuild/node_modules/express/lib/router/layer.js:95:5) 

从我所收集，我们的情形之间的区别是，他们在启动时的节点服务器收到错误，但我开始罚款。只有在我设置了我的第一个API请求之后，我才开始遇到这个问题。

的问题脚本如下：

const mongoose = require('mongoose'); 
const passport = require('passport'); 
const User = require('../../models/user.js'); 

module.exports = function(app) { 

app.post('/api/login', function(request, response) { 
    User.findOne({ email: request.body.email }) 
    .then(function(data) { 
     if (data.email) { 
     passport.authenticate('local')(request, response,() => { 
      if (request.user) { 
      return response.send(JSON.stringify(request.user)); 
      } 
     }); 
     } 

     return response.send(JSON.stringify({ error: 'There was an error logging in.'})); 
    }) 
    .catch(error => console.log(error)); 
}); 

这里也是很好的措施我server.js文件。

const path = require('path'); 
const express = require('express'); 
const logger = require('morgan'); 
const bodyParser = require('body-parser'); 
const mongoose = require('mongoose'); 
const passport = require('passport'); 
const LocalStrategy = require('passport-local').Strategy; 
const expressSession = require('express-session')({ 
    secret: 'some random string', 
    resave: false, 
    saveUninitialized: false 
}); 

const app = express(); 
const PORT = process.env.PORT || 3000; 

mongoose.connect('mongodb://localhost/todo', {useMongoClient: true 
}); 
const db = mongoose.connection; 
//models 
const User = require('./models/user'); 

app.use(express.static(path.join(__dirname, './public'))); 
app.use(logger('dev')); 
app.use(bodyParser.json()); 
app.use(bodyParser.urlencoded({ extended: false })); 
app.use(bodyParser.text()); 
app.use(bodyParser.json({ type: 'application/vnd.api+json' })); 
app.use(expressSession); 
app.use(passport.initialize()); 
app.use(passport.session()); 

passport.use(new LocalStrategy(User.authenticate())); 
passport.serializeUser(User.serializeUser()); 
passport.deserializeUser(User.deserializeUser()); 

//routes 
require('./routes/api/api-routes.js')(app); 

app.get('*', function(request, response) { 
    response.sendFile('index.html'); 
}); 

db.on('error', function(error) { 
    console.log('Mongoose Error: ', error); 
}); 

db.once('open', function() { 
    console.log('Mongoose connection successful.'); 
}); 

app.listen(PORT, 'localhost', function() { 
    console.log('App running on port 3000'); 
}); 

依赖

"dependencies": { 
    "axios": "^0.16.2", 
    "babel-core": "^6.26.0", 
    "babel-loader": "^7.1.2", 
    "babel-preset-env": "^1.6.0", 
    "babel-preset-es2015": "^6.24.1", 
    "babel-preset-import-export": "^1.0.2", 
    "babel-preset-react": "^6.24.1", 
    "babel-preset-stage-2": "^6.24.1", 
    "body-parser": "^1.18.2", 
    "express": "^4.16.1", 
    "express-session": "^1.15.6", 
    "history": "^4.7.2", 
    "mongoose": "^4.12.0", 
    "morgan": "^1.9.0", 
    "passport": "^0.4.0", 
    "passport-local": "^1.0.0", 
    "passport-local-mongoose": "^4.2.1", 
    "react": "^16.0.0", 
    "react-dom": "^16.0.0", 
    "react-redux": "^5.0.6", 
    "react-router": "^4.2.0", 
    "react-router-dom": "^4.2.2", 
    "react-router-redux": "^4.0.8", 
    "redux": "^3.7.2", 
    "webpack": "^3.6.0" 
    } 

同样，我为我的无知道歉。 :(

Answer 1

堆栈跟踪这样说：

at /Users/eric/Documents/todobuild/server.js:40:12

所以问题是线40 server.js一个受过教育的猜测表明，40行是这一行：

response.sendFile('index.html'); 

Google文档sendFile是在这里：

https://expressjs.com/en/4x/api.html#res.sendFile

关键的事情是，你正在使用的相对路径index.html但sendFile需要一个绝对路径，例如：

response.sendFile(path.join(__dirname, 'index.html'));