未收到node.js POST回调

Question

I am POSTing a json file to a node.js listener, and I must not fully understand how POSTs are properly constructed, because in the code below the on('data') callback is never invoked. I can see the actual json string in the body, so I can work around the lack of a callback, but it seems like I'm doing something wrong with how I generate my POST request. [Postman details further below]

 // Server initialization var server = restify.createServer(); server.use(restify.queryParser()); server.use(CookieParser.parse); server.use(restify.bodyParser()); // Later, at the point where I register callbacks. this.server.post('receive', function (request, respond) { console.log('Received POST'); console.log("Headers: %s", JSON.stringify(request.headers)); console.log("Body: %s", JSON.stringify(request.body)); var body = '' ; var filePath = './data/notes.json'; // this event is never triggered. request.on('data', function (data) { console.log('Data received.'); body += data; }); request.on('end', function () { console.log('End of POST'); fs.writeFile(filePath, body, function () { respond.end(); }); }); }); 

POST details: I'm using Postman to create a POST request, Content-Type: application/json and the putting the json string in the raw body. What will normally trigger the 'data' event in a POST request? If I ignore data events and just read from the request body, will I run into issues?

Answer 1

Since you're using restify.bodyParser , that middleware would have already read the request body so there isn't any more for your handler to read (hence no data events). A stream, like request , can only be read once, until it's exhausted. You can't "re-read" it.

Which also means that you can just use request.body , which should be the (parsed) result of the JSON that you're posting.

As an aside: I don't know Postman very well, but it looks like you're sending a JSON-encoded string to the server, as opposed to a JSON-encoded object .

To send the latter, I would expect that this should be the raw body data:

{"body":"this is a test"}