#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QtNetwork/QNetworkAccessManager>
#include <QUrl>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QDebug>
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    Ui::MainWindow *ui;
 
private slots:
    void on_pushButton_clicked();
    void searshFinished(QNetworkReply*);
};
 
#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
    QNetworkRequest request;
    request.setUrl(QUrl("http://www.yandex.ru/"));
    request.setRawHeader("Host", "yandex.ru");
    request.setRawHeader("User-Agent", "Mozilla/5.0 (X11; U; Linux x86_64; ru; rv:1.9.0.10) Gecko/2009042809 GranParadiso/3.0.10");
    //request.setRawHeader("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)");
    //request.setRawHeader("User-Agent", "Opera/9.80 (Windows NT 6.1; U; en) Presto/2.9.168 Version/11.50");
    //request.setRawHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    //request.setRawHeader("Accept-Language", "en-us,en;q=0.5");
    //request.setRawHeader("Accept-Encoding", "gzip,deflate");
    //request.setRawHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    request.setRawHeader("Keep-Alive", "115");
    request.setRawHeader("Connection", "keep-alive");
    //request.setRawHeader("Referer", urlBytes);
    //request.setRawHeader("Cookie", "");
    //request.setRawHeader("Content-Type", "application/x-www-form-urlencoded");
    //request.setRawHeader("Content-Length", "557");
 
 
    QNetworkAccessManager* manager = new QNetworkAccessManager(this);
    connect(manager, SIGNAL(finished(QNetworkReply*)),this, SLOT(searshFinished(QNetworkReply*)));
    manager->get(request);
}
 
void MainWindow::searshFinished(QNetworkReply* reply)
{
    QByteArray ansver = reply->read(reply->bytesAvailable());
    qWarning() << ansver;
}