Generate sitemap using Flask

It's quite easy to generate a sitemap using Flask route map. You can refer this link to see the idea how to generate a sitemap.xml. The code below is my implementation for my website.

def sitemap():
    """Generate sitemap.xml """
    pages = []
    # All pages registed with flask apps
    for rule in app.url_map.iter_rules():
        if "GET" in rule.methods and len(rule.arguments) == 0:
            pages.append(rule.rule)

    sitemap_xml = render_template('sitemap_template.xml', pages=pages)
    response = make_response(sitemap_xml)
    response.headers["Content-Type"] = "application/xml"

    return response