gistfile1.js

const fs = require('fs');
const http = require('http');
const crypto = require('crypto');

const image_location = 'some-image-in-current-folder.jpg';

const config = {
	recognizeIm: {
		clientId: '',
		apiKey: '',
		clAPIKey: '',
		hostname: 'clapi.itraff.pl',
		port: '80',
		version: '/v2'
	}
};

fs.readFile(image-location, (err, data) => {
	if(err) 
		throw err;

	console.log(data);
	var base64Image = new Buffer(data).toString('base64');

	var hash = crypto.createHash('md5')
		.update(config.recognizeIm.apiKey)
		.update(base64Image)
		.digest('hex');

	console.log(hash);

	var options = {
		hostname: config.recognizeIm.hostname,
		port: config.recognizeIm.port,
		path: config.recognizeIm.version + '/recognize/' + 'shelf/' + config.recognizeIm.clientId,
		method: 'POST',
		headers: {
			'Content-Type': 'image/jpeg',
			'x-itraff-hash': hash
		}
	};

	var request = http.request(options, (response) => {
		console.log('STATUS: ' + response.statusCode);
		console.log('HEADERS: ' + JSON.stringify(response.headers));

		response.setEncoding('utf8');
		response.on('data', (chunk) => {
			console.log('BODY: ' + chunk);
		});

		response.on('end', () => {
			console.log('End of Response');
		})
	});

	request.on('error', (e) => {
		console.log('problem with request: ' + e);
	});

	request.write(base64Image);
	request.end();
});