How to get .tar.gz archive from unirest response?

Question

I develop a tool converting ttf font to other formats using onlinefontconverter.com API. So I have a problem with obtaining propper tar.gz archive. I get file, but OS told me that archive is damaged. So how can I save file from response body? Here is code i used:

'use strict';
const unirest = require('unirest');
const fs = require('fs');
const file = fs.createWriteStream('./onlinefontconverter.com.tar.gz');

unirest.post("https://ofc.p.mashape.com/directConvert/")
  .header("X-Mashape-Key", "key")
  .attach("file", fs.createReadStream('./Roboto-Thin.ttf'))
  .field("format", "svg")
  .end((result) => {
     file.write(result.body, {encoding:'binary'});
  });

Here is headers:

{ 'accept-ranges': 'bytes',
  'access-control-allow-headers': 'X-Mashape-Key',
  'access-control-allow-methods': 'POST, OPTIONS',
  'access-control-allow-origin': '*',
  'access-control-expose-headers': 'Content-Disposition',
  'cache-control': 'public, max-age=0',
  'content-disposition': 'attachment; filename="onlinefontconverter.com.tar.gz"',
  'content-type': 'application/octet-stream',
  date: 'Mon, 02 Jan 2017 18:52:34 GMT',
  expires: '0',
  'last-modified': 'Mon, 02 Jan 2017 18:52:34 GMT',
  pragma: 'no-cache',
  server: 'Mashape/5.0.6',
  via: '1.1 vegur',
  'content-length': '119251',
  connection: 'Close' }

UPD: I've a problem with unirest, so I've rewritten on simple request.

const file = fs.createWriteStream('./fonts.tar.gz');
const request = require('request');
var r = request.post({
  url:     'https://ofc.p.mashape.com/directConvert/',
  headers: {'X-Mashape-Key' : 'key'},
}, function(error, response, body){
  // console.log(body);
  // console.log(response.statusCode);
  // console.log(response.headers);

});
r.pipe(file);
var form = r.form();
form.append('format', 'ttf');
form.append('my_file', fs.createReadStream('Aller_Rg.ttf'));

Answer 1

I think that this is a problem of incorrect encoding of response in unirest library. Try something like this (and hide your secret key):

'use strict';
const fs = require('fs');

const request = require('request');

const formData = {
  format: 'svg',
  file: fs.createReadStream('./Roboto-Thin.ttf')
}

var buff = [];
request.post({  url: "https://ofc.p.mashape.com/directConvert/",
            formData: formData,
            headers: {
                "X-Mashape-Key": "SecretMashapeKey"
            }
             })
        .on('data', function(chunk) {
            buff.push(chunk);
        })
        .on('end', function() {
            var data = Buffer.concat( buff );
            fs.writeFileSync( 'onlinefontconverter.com.tar.gz',
                              data, 
                              'binary' );
        });