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private:
....
QNetworkAccessManager manager;
...

...
connect(&manager, SIGNAL(finished(QNetworkReply *)),
          this, SLOT(replyIsRecieved(QNetworkReply *)));
...

manager.get(QNetworkRequest(url));

#ifndef AA_H
#define AA_H

#include <QObject>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QDebug>
class A : public QObject
{
  Q_OBJECT
  QNetworkAccessManager manager;
public:
    A(QObject *parent = 0);
    ~A();
    void doRequest();
private slots:
  void replyIsRecieved(QNetworkReply* reply);    
};

#endif // AA_H

#include "aa.h"

A::A(QObject *parent)
  : QObject(parent)
{
  connect(&manager, SIGNAL(finished(QNetworkReply *)),
           SLOT(replyIsRecieved(QNetworkReply *)));
}

A::~A()
{

}
void A::doRequest()
{
  QNetworkReply *currentReply = manager.get(QNetworkRequest(QUrl("www.ya.ru")));
}

void A::replyIsRecieved(QNetworkReply* reply)
{
 qDebug() << "OK";
}

#ifndef B_H
#define B_H

#include <QDialog>
#include <aa.h>
class B : public QObject
{
  Q_OBJECT

public:
    B(QObject *parent = 0, A *man = 0);
    ~B();
    void makeRequest();
private:
  A *requestManager;  
};

#endif // B_H

#include "b.h"

B::B(QObject *parent, A *man)
  : QObject(parent)
{
  requestManager = man;
}

B::~B()
{

}

void B::makeRequest()
{
  requestManager->doRequest(); 
}

#include <QtGui/QApplication>
#include <QNetworkAccessManager>
#include <QDialog>
#include <aa.h>
#include <b.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    A reqMan;
    B wnd(0, &reqMan);
    wnd.makeRequest();
    return a.exec();
}