Question

我有一个react front应用，该应用基于lambda和express调用rest api。集成是通过AWS API Gateway完成的。即使使用cors模块也无法实现我想要的功能。

这是代码：

const express = require('express');
const app = express();

require('dotenv').config();
const youTube = require('./lib/youtube');
const ffmpeg = require('fluent-ffmpeg');
const Logger = require('./lib/logger');
const cors = require('cors');
const serverLogger = new Logger(__filename);

// Init Middleware
app.use(express.json({ extended: true }));
app.use(cors({ origin: true }));

app.get('/', (req, res) => {
    res.json({ msg: 'Welcome to the YouTube downloader API...' });
});


app.post('/api/youtube/download', async (req, res) => {
    const body = req.body;
    const { url } = body;

    res.header('Content-disposition', 'attachment; filename=video.mp3');
    res.header('Access-Control-Allow-Headers', 'Content-Type');
    res.header('Access-Control-Allow-Methods', 'OPTIONS,POST,GET');
    res.header('Access-Control-Allow-Origin', '*');
    
    const youTubeStream = await youTube.getStream(url);
    ffmpeg(youTubeStream)
        .format('mp3')
        .audioBitrate('192k')
        .on('end', function () {
            console.log('file has been converted succesfully');
            res.status(200);
        })
        .on('error', function (err) {
            console.log('an error happened: ' + err.message);
            res.status(500).json({ error: err.message });
        })
        // save to stream
        .pipe(res, { end: true });
});
app.post('/api/youtube/info', async (req, res) => {
    const body = req.body;
    console.log(body);
    const { url } = body;

    const title = await youTube.getInfo(url);
    console.log(title);
    res.status(200).json({ title: title });
});

module.exports = app;

我不断收到此消息：

从原点“ ...”获取“ ...”处的访问已被CORS策略阻止：请求的资源上不存在“ Access-Control-Allow-Origin”标头。如果不透明的响应可以满足您的需求，请将请求的模式设置为“ no-cors”，以在禁用CORS的情况下获取资源。

具有AWS API Gateway 502网关错误的Lambda（节点）Express REST API

0 个答案: