Qt HTTP Server ロギング

#include <QCoreApplication>
#include <QHttpServer>
#include <QLoggingCategory>

int main(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    QHttpServer server;
    auto tcpserver = std::make_unique<QTcpServer>();
    if (!tcpserver->listen(QHostAddress::LocalHost, 8000) || !server.bind(tcpserver.get()))
        return -1;
    tcpserver.release();

    server.route("/loggingFilter", [] (const QHttpServerRequest &request) {
        QString filter;
        QTextStream result(&filter);
        for (auto pair : request.query().queryItems()) {
            if (!filter.isEmpty())
                result << "\n";
            result << pair.first << "=" << pair.second;
        }
        QLoggingCategory::setFilterRules(filter);
        return filter;
    });

    return app.exec();
}