def table_xchange_author_title():
    vals = request.get_json().get('xchange')
    if vals:
        for val in vals:
            modif_date = False
            book = calibre_db.get_book(val)
            authors = book.title
            book.authors = calibre_db.order_authors([book])
            author_names = []
            for authr in book.authors:
                author_names.append(authr.name.replace('|', ','))

            title_change = handle_title_on_edit(book, " ".join(author_names))
            input_authors, authorchange, renamed = handle_author_on_edit(book, authors)
            if authorchange or title_change:
                edited_books_id = book.id
                modif_date = True

            if config.config_use_google_drive:
                gdriveutils.updateGdriveCalibreFromLocal()

            if edited_books_id:
                helper.update_dir_structure(edited_books_id, config.config_calibre_dir, input_authors[0],
                                           renamed_author=renamed)
            if modif_date:
                book.last_modified = datetime.utcnow()
            try:
                calibre_db.session.commit()
            except (OperationalError, IntegrityError) as e:
                calibre_db.session.rollback()
                log.error_or_exception("Database error: %s", e)
                return json.dumps({'success': False})

            if config.config_use_google_drive:
                gdriveutils.updateGdriveCalibreFromLocal()
        return json.dumps({'success': True})
    return ""
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.