An error occurred while sending a post request to get a token. How to fix?

Question

JavaScript

Sending a request:

var request = require('request');
  request.post('https://oauth.yandex.ru/token', {
    'grant_type': 'authorization_code',
    'code': req.query.code,
    'client_id': 'c48956d9f59442bab960f373a6ca5ba2',
    'client_secret': '9e46f2c8fefb4f55bf63b06066431c4d',
  }, function(err, httpResponse, body) {
    console.log(body);
  });

Error

In postman, the same request works fine