Issues with nodejs' request and pipe - node.js

Question

I'm having an issue with the following code. I'm trying to make a POST request (json) to a URL using pipe but I get the error "write after end" - Internal Server Error. Can someone please help?
test: function( req, res, next) {
var requesty = request.post({
url: dataUrl,
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(body)
});
req.pipe(requesty).on('error', function (error) {
logger.withRequestLog(res, 'error', 'CC Melville Proxy failed!', {
assetUrl: dataUrl,
error: error,
});
next(error);
}).pipe(res);
}

Answer 1

You are getting error because of body: JSON.stringify(body). You can't (also don't need) to pass body as when you are piping raw bytes are being piped as well. Also This middleware should be FIRST as you don't want to use bodyParser etc which will read the stream and make it empty.
Below is an working example where I am proxying my request to one my routes(It can be external also):
const express = require('express');
const app = express();
const request = require('request');
const bodyParser = require('body-parser').json();
const dataUrl = '/employees'
app.use(dataUrl, bodyParser, (req, res)=>{
res.json({
body: req.body || {},
method: req.method,
param: req.params,
headers: req.headers,
url: req.url
});
})
app.use('/', (req, res) => {
var requesty = request({
url: 'http://localhost:8080'+dataUrl,
headers: {
'Content-Type': 'application/json'
},
})
req.pipe(requesty).on('error', function (error) {
console.log('error', 'CC Melville Proxy failed!', {
assetUrl: dataUrl,
error: error,
});
}).pipe(res);
});
app.listen(8080, () => {
console.log('started');
})
Note: You don't need to specify method as it will automatically be passed. From the doc:
You can also pipe() from http.ServerRequest instances, as well as to
http.ServerResponse instances. The HTTP method, headers, and
entity-body data will be sent.