How can I print webpage to pdf using webkitgtk

I am using webitgtk6

#include <webkit/webkit.h>

Here are printing result functions

static void print_finished(WebKitPrintOperation *operation, gpointer user_data)
{
    g_print("Done\n");

    g_object_unref(user_data);
    g_object_unref(operation);
}

static void print_failed(WebKitPrintOperation *operation, GError *error, gpointer user_data)
{
    g_print("Failed %s\n", error->message);
    g_object_unref(user_data);
    g_object_unref(operation);
}

This function saves the page on a button click

static void save_page(GtkButton *button, WebKitPrintOperation *operation)
{
    const gchar *path = g_get_user_special_dir(G_USER_DIRECTORY_DOCUMENTS);
    gchar *filename = "simple";
    GtkPrintSettings *settings = gtk_print_settings_new();
    g_signal_connect(operation, "finished", G_CALLBACK(print_finished), settings);
    g_signal_connect(operation, "failed", G_CALLBACK(print_failed), settings);
    gtk_print_settings_set(settings, GTK_PRINT_SETTINGS_OUTPUT_BASENAME, filename);
    gtk_print_settings_set(settings, GTK_PRINT_SETTINGS_OUTPUT_FILE_FORMAT, "pdf");
    gtk_print_settings_set(settings, GTK_PRINT_SETTINGS_OUTPUT_DIR, path);
    gtk_print_settings_set_paper_size(settings, gtk_paper_size_new(GTK_PAPER_NAME_A3));
    gtk_print_settings_set_printer(settings, "Print to File");
    webkit_print_operation_set_print_settings(operation, settings);
}

The on activate function

static void activate(GtkApplication *application, gchar *home)
{
    GtkWidget *widget = webkit_web_view_new();
    GtkWidget *parent = gtk_application_window_new(application);
    GtkWidget *child = gtk_overlay_new();
    GtkWidget *button = gtk_button_new_with_label("Start");
    GtkWindow *window = GTK_WINDOW(parent);
    GtkOverlay *overlay = GTK_OVERLAY(child);
    WebKitWebView *webview = WEBKIT_WEB_VIEW(widget);
    WebKitNetworkSession *session = webkit_web_view_get_network_session(webview);
    WebKitCookieManager *cookiejar = webkit_network_session_get_cookie_manager(session);
    const gchar *allowlist[] = {"https://www.example.com", "https://subdomain.example.com", NULL};
    gtk_overlay_set_child(overlay, widget);
    gtk_overlay_add_overlay(overlay, button);

    gtk_widget_set_halign(button, GTK_ALIGN_START);
    gtk_widget_set_valign(button, GTK_ALIGN_START);
    gtk_widget_set_size_request(button, 72, 48);
    gtk_widget_set_size_request(parent, 1024, 576);
    gtk_window_set_child(window, child);
    gchar *storage = g_strdup_printf("%ssession.db", home);
    gchar *uri = "https://bing.com";
    webkit_cookie_manager_set_persistent_storage(cookiejar, storage, WEBKIT_COOKIE_PERSISTENT_STORAGE_SQLITE);
    webkit_web_view_set_cors_allowlist(webview, allowlist);
    webkit_web_view_load_uri((WebKitWebView *)webview, uri);

    g_free(home);
    g_free(storage);
    g_signal_connect(webview, "load-changed", G_CALLBACK(load_changed), NULL);
    g_signal_connect(button, "clicked", G_CALLBACK(save_page), webkit_print_operation_new(webview));
    gtk_window_present(window);
}

The main function

int main(int argc, char *argv[])
{
    gchar *home = g_strdup_printf("%s/foobar/", g_get_user_data_dir());
    GtkApplication *app = gtk_application_new("com.foo.bar", G_APPLICATION_DEFAULT_FLAGS);
    g_signal_connect(app, "activate", G_CALLBACK(activate), home);
    g_application_run((GApplication *)app, argc, argv);
    return 0;
}

save page runs but neither print_finished nor print_failed is reached and the pdf not created

I am expecting to see the file in ~/Documents/simple.pdf. I tried putting in

path manually /home/user//Documents/ it still doesn't create the pdf

I have also removed the line webkit_web_view_set_cors_allowlist(webview, allowlist); with the same result