qt-everywhere-src-5.15.1/qtbase/doc/src/snippets/code/src_network_access_qhttp.cpp

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//! [0]
content-type: text/html
//! [0]


//! [1]
header.setValue("content-type", "text/html");
QString contentType = header.value("content-type");
//! [1]


//! [2]
QHttpRequestHeader header("GET", QUrl::toPercentEncoding("/index.html"));
header.setValue("Host", "qt-project.org");
http->setHost("qt-project.org");
http->request(header);
//! [2]


//! [3]
http->setHost("qt-project.org");                // id == 1
http->get(QUrl::toPercentEncoding("/index.html")); // id == 2
//! [3]


//! [4]
requestStarted(1)
requestFinished(1, false)

requestStarted(2)
stateChanged(Connecting)
stateChanged(Sending)
dataSendProgress(77, 77)
stateChanged(Reading)
responseHeaderReceived(responseheader)
dataReadProgress(5388, 0)
readyRead(responseheader)
dataReadProgress(18300, 0)
readyRead(responseheader)
stateChanged(Connected)
requestFinished(2, false)

done(false)

stateChanged(Closing)
stateChanged(Unconnected)
//! [4]


//! [5]
http->setHost("www.foo.bar");       // id == 1
http->get("/index.html");           // id == 2
http->post("register.html", data);  // id == 3
//! [5]


//! [6]
requestStarted(1)
requestFinished(1, false)

requestStarted(2)
stateChanged(HostLookup)
requestFinished(2, true)

done(true)

stateChanged(Unconnected)
//! [6]


//! [7]
void Ticker::getTicks()
{
  http = new QHttp(this);
  connect(http, SIGNAL(done(bool)), this, SLOT(showPage()));
  http->setProxy("proxy.example.com", 3128);
  http->setHost("ticker.example.com");
  http->get("/ticks.asp");
}

void Ticker::showPage()
{
  display(http->readAll());
}
//! [7]