network: provide common HTTP GET functionality with js callbacks

src/qt/network.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <QCoreApplication>
+#include <QtNetwork>
+
+#include "FutureScheduler.h"
+
+class Network : public QObject
+{
+    Q_OBJECT
+public:
+    Network(QObject *parent = nullptr);
+
+public:
+    Q_INVOKABLE void get(const QString &url, const QJSValue &callback, const QString &contentType = {}) const;
+    Q_INVOKABLE void getJSON(const QString &url, const QJSValue &callback) const;
+
+private:
+    mutable FutureScheduler m_scheduler;
+};