We'll begin, in our index.js file, by requiring the fs, http, and pump modules:

const fs = require('fs') 
const http = require('http') 
const pump = require('pump') 

Now let's create our HTTP server and pump instead of pipe our big file stream to our response stream:

const server = http.createServer((req, res) => { 
  const stream = fs.createReadStream('big.file') 
  pump(stream, res, done) 
}) 
 
function done (err) { 
  if (err) { 
    return console.error('File was not fully streamed to the user', 
    err) 
  } 
  console.log('File was fully streamed to the user') 
} 
 
server.listen(3000) 

Now let's run our server:

$ node index.js 

If we use curl and hit Ctrl + C before finishing the download, we should be able to trigger the error state, with the server logging that the file was not fully streamed to the user:

$ curl http://localhost:8080 # hit Ctrl + C before finish