Simple Example | Qt HTTP Server 6.4.1

- Qt 6.4
- Qt HTTP Server
- Qt HTTP Server Examples
- Simple Example
- Qt 6.4.1 Reference Documentation

# 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();
     }