我正在尝试使用以下Facebook-messenger-tutorial通过https://developers.facebook.com/docs/messenger-platform/getting-started/webhook-setup通过heroku创建并托管一个Webhook。 因此，我目前正在测试对本地主机的cURL请求。此请求：
curl -H "Content-Type: application/json" -X POST "localhost:3000/" -d "{""object"": ""page"",""entry"": [{""messaging"": [{""message"": ""TEST_MESSAGE""}]}]}"
应该在cmd中返回EVENT RECEIVED，在第二个cmd窗口中返回TEST_MESSAGE，我将在其中执行我的应用程序。 为了执行该应用程序，我使用了$ node index.js，并且接收到“ webhook侦听”，这对我来说意味着我执行它的方式没有错误。
这是我的文件index.js的样子：
'use strict';
// Imports dependencies and set up http server
const
express = require('express'),bodyParser = require('body-parser'),app = express().use(bodyParser.json()); // creates express http server
// Sets server port and logs message on success
app.listen(process.env.PORT || 3000,() => console.log('webhook is listening'));
// Creates the endpoint for our webhook
app.post('/webhook',(req,res) => {
let body = req.body;
// Checks this is an event from a page subscription
if (body.object === 'page') {
// Iterates over each entry - there may be multiple if batched
body.entry.forEach(function(entry) {
// Gets the message. entry.messaging is an array,but
// will only ever contain one message,so we get index 0
let webhook_event = entry.messaging[0];
console.log(webhook_event);
});
// Returns a '200 OK' response to all requests
res.status(200).send('EVENT_RECEIVED');
} else {
// Returns a '404 Not Found' if event is not from a page subscription
res.sendStatus(404);
}
});
// Adds support for GET requests to our webhook
app.get('/webhook',res) => {
// Your verify token. Should be a random string.
let VERIFY_TOKEN = "somepassword"
// Parse the query params
let mode = req.query['hub.mode'];
let token = req.query['hub.verify_token'];
let challenge = req.query['hub.challenge'];
// Checks if a token and mode is in the query string of the request
if (mode && token) {
// Checks the mode and token sent is correct
if (mode === 'subscribe' && token === VERIFY_TOKEN) {
// Responds with the challenge token from the request
console.log('WEBHOOK_VERIFIED');
res.status(200).send(challenge);
} else {
// Responds with '403 Forbidden' if verify tokens do not match
res.sendStatus(403);
}
}
});
这是我得到的响应（一些html代码）：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Error</title>
</head>
<body>
<pre>Cannot POST /</pre>
</body>
</html>
我没有收到错误，只是返回了“错误”。
有人知道如何解决此问题并收到“ EVENT RECEIVED”和“ TEST_MESSAGE”吗？
注意：我看过以下文章Curl command no return，Prometheus API returning HTML instead of JSON，并且确实更改了与Facebook messenger bot error Unexpected token ' in JSON at position 0相关的本教程中的某些代码，但仍然无法修复这个。
我也读过How do I POST JSON data with Curl from a terminal/commandline to Test Spring REST?，但它也不能解决我的问题。