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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qthttpserver-logging.html
\title Qt HTTP Server Logging
\brief Shows how the QtHttpServer module logging can be configured.
The Qt HTTP Server logs using the \l {QLoggingCategory} {QLoggingCategory}
class. The logging categories starting with "qt.httpserver" are used by the
different parts of the Qt Http Server. These can be enabled and disabled as
described in \l {QLoggingCategory}.
To dynamically enable or disable what is being logged call
\l {QLoggingCategory::setFilterRules()}. A server can add a URL to change
the filter rules, by using the \l QHttpServer::route() function as shown below.
\code
#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();
}
\endcode
The filter rules can now be set using:
"http://127.0.0.1:8000/loggingFilter?qt.httpserver=true&appname.access=true".
In this case all Qt HTTP Server logging will be enabled, and in addition the
hypothetical logging category "appname.access" is enabled.
\sa QLoggingCategory, QHttpServer
*/
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