QNetworkReply and QNetworkAccessManager timeout in http request

Question

How do I setup a timeout when I do an http request?

I have this code:

{
    QNetworkRequest request;

    request.setUrl(QUrl("http://www.foo.com"));
    request.setRawHeader("User-Agent", USER_AGENT.toUtf8());
    request.setRawHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    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("Connection", "Keep-Alive");

    reply = m_networkManager->get(request);
    QEventLoop loop;
    connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
    loop.exec();
}

Where and how do I setup some kind of timeout to the request?

I am using m_networkManager->setTransferTimeout(30000) – Arun K Sep 28 '21 at 13:56 — Arun K, Sep 28 '21 at 13:56

score 27 · Accepted Answer · edited Jun 06 '13 at 16:19

27

QTimer timer;    
timer.setSingleShot(true);

QEventLoop loop;
connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));
timer.start(30000);   // 30 secs. timeout
loop.exec();

if(timer.isActive()) {
    timer.stop();
    if(m_reply->error() > 0) {
      ... // handle error
    }
    else {      
      int v = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();

      if (v >= 200 && v < 300) {  // Success
        ...
      }
    }
} else {
   // timeout
   disconnect(reply, SIGNAL(finished()), &loop, SLOT(quit()));

   reply->abort();
}

edited Jun 06 '13 at 16:19

Morten Kristensen

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answered Nov 05 '12 at 10:11

cyber_raj

1,780
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3

Don't forget to delete the reply. – Dave Oct 01 '13 at 09:25
With download file process, with big file we need timeout bigger? Solution for this case? – kien bui Jun 26 '18 at 10:41
@kienbui No. There are separate signals for this, e.g. `bytesAvailable` or `uploadProgress` – Zimano Jul 16 '18 at 12:39
1

We can vote "add builtin support for network timeouts" at here: https://bugreports.qt.io/browse/QTBUG-3443 – kien bui Oct 09 '18 at 03:05
this is a brilliant solution @cyber_raj – CybeX Jun 08 '20 at 06:20

score 4 · Answer 2 · answered Jan 15 '22 at 04:58

check this out:

https://doc.qt.io/qt-5/qnetworkrequest.html#setTransferTimeout

void QNetworkRequest::setTransferTimeout(int timeout = DefaultTransferTimeoutConstant) Sets timeout as the transfer timeout in milliseconds.

Transfers are aborted if no bytes are transferred before the timeout expires. Zero means no timer is set. If no argument is provided, the timeout is QNetworkRequest::DefaultTransferTimeoutConstant. If this function is not called, the timeout is disabled and has the value zero.

This function was introduced in Qt 5.15.

QNetworkReply and QNetworkAccessManager timeout in http request

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