Simple Example

 // Copyright (C) 2018 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #include <QtCore>
 #include <QtHttpServer>

 static inline QString host(const QHttpServerRequest &request)
 {
     return QString::fromLatin1(request.value("Host"));
 }

 int main(int argc, char *argv[])
 {
     QCoreApplication app(argc, argv);

     QHttpServer httpServer;
     httpServer.route("/", []() {
         return "Hello world";
     });

     httpServer.route("/query", [] (const QHttpServerRequest &request) {
         return QString("%1/query/").arg(host(request));
     });

     httpServer.route("/query/", [] (qint32 id, const QHttpServerRequest &request) {
         return QString("%1/query/%2").arg(host(request)).arg(id);
     });

     httpServer.route("/query/<arg>/log", [] (qint32 id, const QHttpServerRequest &request) {
         return QString("%1/query/%2/log").arg(host(request)).arg(id);
     });

     httpServer.route("/query/<arg>/log/", [] (qint32 id, float threshold,
                                               const QHttpServerRequest &request) {
         return QString("%1/query/%2/log/%3").arg(host(request)).arg(id).arg(threshold);
     });

     httpServer.route("/user/", [] (const qint32 id) {
         return QString("User %1").arg(id);
     });

     httpServer.route("/user/<arg>/detail", [] (const qint32 id) {
         return QString("User %1 detail").arg(id);
     });

     httpServer.route("/user/<arg>/detail/", [] (const qint32 id, const qint32 year) {
         return QString("User %1 detail year - %2").arg(id).arg(year);
     });

     httpServer.route("/json/", [] {
         return QJsonObject{
             {
                 {"key1", "1"},
                 {"key2", "2"},
                 {"key3", "3"}
             }
         };
     });

     httpServer.route("/assets/<arg>", [] (const QUrl &url) {
         return QHttpServerResponse::fromFile(QStringLiteral(":/assets/%1").arg(url.path()));
     });

     httpServer.route("/remote_address", [](const QHttpServerRequest &request) {
         return request.remoteAddress().toString();
     });

     // Basic authentication example (RFC 7617)
     httpServer.route("/auth", [](const QHttpServerRequest &request) {
         auto auth = request.value("authorization").simplified();

         if (auth.size() > 6 && auth.first(6).toLower() == "basic ") {
             auto token = auth.sliced(6);
             auto userPass = QByteArray::fromBase64(token);

             if (auto colon = userPass.indexOf(':'); colon > 0) {
                 auto userId = userPass.first(colon);
                 auto password = userPass.sliced(colon + 1);

                 if (userId == "Aladdin" && password == "open sesame")
                     return QHttpServerResponse("text/plain", "Success\n");
             }
         }
         QHttpServerResponse response("text/plain", "Authentication required\n",
                                      QHttpServerResponse::StatusCode::Unauthorized);
         response.setHeader("WWW-Authenticate", R"(Basic realm="Simple example", charset="UTF-8")");
         return response;
     });

     const auto port = httpServer.listen(QHostAddress::Any);
     if (!port) {
         qDebug() << QCoreApplication::translate("QHttpServerExample",
                                                 "Server failed to listen on a port.");
         return 0;
     }

     const auto sslCertificateChain =
             QSslCertificate::fromPath(QStringLiteral(":/assets/certificate.crt"));
     if (sslCertificateChain.empty()) {
         qDebug() << QCoreApplication::translate("QHttpServerExample",
                                                 "Couldn't retrive SSL certificate from file.");
         return 0;
     }
     QFile privateKeyFile(QStringLiteral(":/assets/private.key"));
     if (!privateKeyFile.open(QIODevice::ReadOnly)) {
         qDebug() << QCoreApplication::translate("QHttpServerExample",
                                                 "Couldn't open file for reading.");
         return 0;
     }
     httpServer.sslSetup(sslCertificateChain.front(), QSslKey(&privateKeyFile, QSsl::Rsa));
     privateKeyFile.close();

     const auto sslPort = httpServer.listen(QHostAddress::Any);
     if (!sslPort) {
         qDebug() << QCoreApplication::translate("QHttpServerExample",
                                                 "Server failed to listen on a port.");
         return 0;
     }

     qDebug() << QCoreApplication::translate("QHttpServerExample",
                                             "Running on http://127.0.0.1:%1/ and "
                                             "https://127.0.0.1:%2/ (Press CTRL+C to quit)")
                         .arg(port)
                         .arg(sslPort);

     return app.exec();
 }