CODEWITHSUNDEEP
javascriptnode.jsnode.js-streamnode.js-connectnode.js-client
Mark
Mark

Reputation: 69

res.write is not returning the expected value

This is the code:

var http = require('http')

var options = { 
    hostname: 'localhost',
    method: 'POST',
    port: 8000,
    path: '/'
}

var s = 3;

http.request(options, (res)=>{  
}).end(s+'')


http.createServer((req, res)=>{ 
    res.writeHead(200, {'Content-type': 'text/plain'})
    var a = "";
    req.on('data', (data)=>{        
        a+= data
    })  
    req.on('end', ()=>{
        res.write(a)
        res.end()       
    })  
}).listen(8000)

Why might the server be returning invalid information to the client when a return value of 3 is expected?

Upvotes: 1

Views: 1658

Answers (2)

Mark
Mark

Reputation: 69

I solved it. It was a problem of visibility of variable a.

var http = require('http')
var a = '';
var options = { 
    hostname: 'localhost',
    method: 'POST',
    port: 8000,
    path: '/'
}

var s = 3;

http.request(options, (res)=>{  
}).end(s+'')


http.createServer((req, res)=>{ 
    res.writeHead(200, {'Content-type': 'text/plain'})
    req.on('data', (data)=>{        
        a+= data
    })  
    req.on('end', ()=>{
        res.write(a)
        res.end()       
    })  
}).listen(8000)

Upvotes: 0

Keith
Keith

Reputation: 24221

It does return 3, but in your example your not collecting it on your request..

Here is a modified version of your code that does the whole Request / Response, like a simple echo.

var http = require('http')

var options = {
    hostname: 'localhost',
    method: 'POST',
    port: 8000,
    path: '/'
}

var s = 3;

http.request(options, (res)=>{
  var str = '';
  //another chunk of data has been recieved, so append it to `str`
  res.on('data', function (chunk) {
    str += chunk;
  });
  //the whole response has been recieved, so we just print it out here
  res.on('end', function () {
    console.log('res: ' + str);
  });
}).end(s+'')


http.createServer((req, res)=>{
    res.writeHead(200, {'Content-type': 'text/plain'})
    var a = "";
    req.on('data', (data)=>{
        a+= data
    })
    req.on('end', ()=>{
        console.log('req: ' + a)
        res.write(a)
        res.end()
    })
}).listen(8000)

Response ->

req: 3
res: 3

Upvotes: 1

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