Hi all,
Revisiting this topic after a hiatus. Thanks for confirming, Thiago and Hamish.
On 13 April 2018 at 10:08, Thiago Macieira <thiago.macie...@intel.com> wrote:
> On quinta-feira, 12 de abril de 2018 15:44:54 PDT Sze Howe Koh wrote:
>> Can QNAM re-use a TCP connection for multiple HTTP requests?
>
> Yes. It's the default. You don't have to do anything to enable it.
In a quick test, I used 1 QNAM to download 12 files simultaneously.
(Windows 10 Pro x64 build 1803, using Qt 5.11.1 + MSVC 2015 32-bit)
In Wireshark, I expected to see my PC send 6 SYNs (because QNAM does 6
connections in parallel and re-uses connections) and 12 GETs (because
I'm downloading 12 files).
However, I saw my PC send 12 SYNs and 12 GETs. I also saw the server
send 12 RSTs, 1 after each file finished downloading. My
interpretation is that the server terminates the connection after each
GET, which prevents connection re-use. Is this expected?
Test code:
const QStringList urls
{
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.win64_msvc2017_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.win64_msvc2015_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.win64_msvc2013_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.win32_msvc2015/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.win32_mingw53/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtwebengine/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtwebengine.win64_msvc2017_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtwebengine.win64_msvc2015_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtwebengine.win32_msvc2015/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtvirtualkeyboard/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtvirtualkeyboard.win64_msvc2017_64/5.9.0-0-201705291821meta.7z";,
"http://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_59/qt.59.qtvirtualkeyboard.win64_msvc2015_64/5.9.0-0-201705291821meta.7z";
};
QNetworkAccessManager nam;
for (auto url : urls)
{
auto reply = nam.get( QNetworkRequest( QUrl(url) ) );
QObject::connect(reply, &QNetworkReply::finished, [=]
{
qDebug() << reply->request().url() << reply->readAll().size();
reply->deleteLater();
});
}
Regards,
Sze-Howe
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