Lab 4.2 - Stream Some Content

louiswol94

Hi there,

app.js file:

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

const stream = require('./stream')

app.get('/data', (req,res) => {
    res.type('text/html')
    res.send(stream());
})

app.listen(3000);

node validate fails with the following:

response data should be "this<br>is<br>a<br>stream<br>of<br>data<br>"

When I visit localhost:3000/data this is the response:

{"_readableState":{"objectMode":false,"highWaterMark":16384,"buffer":{"head":null,"tail":null,"length":0},"length":0,"pipes":.........

Any idea what is wrong?

TIA

louiswol94

Ok this seems to work:

app.get('/data', (req, res) => {
    res.type('text/html');  
    const readableStream = stream();
    readableStream.pipe(res);
});

abraham.m.joseph

function(req, res, next)  {
  res.type('text/html');
  const readable = stream()
  readable.pipe(res, {end: false});
  finished(readable, (err) => {
    if (err) {
      next(err);
      return;
    }
    res.end();
  })
}

This could be another approach. The key is to invoke the stream() function only in the request handler method.

d.m.c

exactly, in Express you have to set up the stream piping. You can also use require('stream').pipeline(stream(), res, next) - the next function is automatically called (with any error) when the pipe finishes