How to avoid memory leak in nodejs?

Question

Node.js

I am writing a spider on nodejs, I am faced with the fact that it constantly eats more and more memory. I tried to make it as simple as possible, this is what happened:

var humanize = require('humanize')
  , request  = require('request');
  
function fetch(url, c) {
  request(url, function(err, resp, body) {
        if (err) {
            c(err);
            return;
        }
        c(err, resp, body)
    });
}  

function callback(err, resp, body) {
    var memory = process.memoryUsage();
    console.log("Memory usage: " + humanize.filesize(memory.heapUsed) + " / " + humanize.filesize(memory.heapTotal));
    fetch('http://google.com', callback);
}

fetch('http://google.com', callback);

After launch, 8.57 MB / 17.77 MB is used, and after 20-30 requests it is already 13.09 MB / 45.71 MB.
Why is this happening and how to avoid increasing memory consumption?
PS I tried to write through events, essentially the same callbacks, but just in case. The result is the same.

Answer 1

habrahabr.ru/post/123154
read paragraph
node --nouse-idle-notification --expose-gc server.js