var request = require('request');
var cheerio = require('cheerio');

var credentials = {
    username: 'user',
    password: 'pass'
};

request.post({
    uri: 'http://mysite.ru/login',
    headers: { 'content–type': 'application/x–www–form–urlencoded' },
    body: require('querystring').stringify(credentials)
}, function(err, res, body){
    if(err) {
        callback.call(null, new Error(' Login failed'));
        return;
    }

    request('http://mysite.ru/all', function(err, res, body) {
        if(err) {
            callback.call(null, new Error('Request failed'));
            return;
        }

        var $ = cheerio.load(body);
        console.log(body);
    });
});