Sending and receiving HTTP data

Requesting information to an HTTP server is a common task. Here again, the Qt folks prepared some useful classes to make it easy. To achieve this, we will rely on three classes:

• QNetworkAccessManager: This class allows your application to send requests and receive replies
• QNetworkRequest: This class holds the request to be sent with all the information (headers, URL, data, and so on)
• QNetworkReply: This class contains the result of a QNetworkRequest class with the headers and the data

The QNetworkAccessManager class is the pivot point of the whole Qt HTTP API. It is built around a single QNetworkAccessManager object that holds the configuration of the client, proxy settings, cache information, and much more. This class is designed to be asynchronous, so you do not need to worry about blocking your current thread.

Let's see it in action in a custom HttpRequest class. First, the header:

#include <QObject> 
#include <QNetworkAccessManager&gt...