如何在qt main()中运行post请求

#include <QCoreApplication>
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QUrl>
#include <QDebug>

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

    // 创建网络访问管理器
    QNetworkAccessManager manager;

    // 创建POST请求
    QNetworkRequest request;
    request.setUrl(QUrl("http://example.com/api")); // 设置请求的URL
    request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded"); // 设置请求头部

    // 构造POST请求的数据
    QByteArray postData;
    postData.append("key1=value1&key2=value2"); // 设置POST请求的参数

    // 发送POST请求
    QNetworkReply *reply = manager.post(request, postData);

    // 处理请求完成的信号
    QObject::connect(reply, &QNetworkReply::finished, [&]() {
        if (reply->error() == QNetworkReply::NoError) {
            // 请求成功
            QByteArray responseData = reply->readAll();
            qDebug() << "Response:" << responseData;
        } else {
            // 请求失败
            qDebug() << "Error:" << reply->errorString();
        }

        // 释放资源
        reply->deleteLater();
        a.quit();
    });

    return a.exec();
}