QHttp signals don't work !!

[probine]

I have a QHttp object.

http = new QHttp("http://localhost", 80);
  http->get("http://localhost/easyadvice/images/logo.jpg", 0);
  .
  .
  .
  connect(http, SIGNAL(readyRead()), this, SLOT(read()));

http = new QHttp("http://localhost", 80);
  http->get("http://localhost/easyadvice/images/logo.jpg", 0);
  .
  .
  .
  connect(http, SIGNAL(readyRead()), this, SLOT(read()));

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The console prints this message:
Object::connect: No such signal QHttp::readyRead()

What is wrong ?