Python werkzeug.urls 模块，url_join() 实例源码

def initiate():
    """
    1. step
    Initiate app installation
    """
    args = request.args

    # get shop url from args
    shop_url = args.get('shop')
    # TODO: validate HMAC, so we know that request really is from shopify

    if not current_user.is_authenticated:
        return redirect(url_for('main.signup', next=url_join(request.host_url,
                                                             url_for('shopify.initiate',
                                                                     shop=shop_url))))

    api_key = current_app.config['SHOPIFY_API_KEY']
    secret = current_app.config['SHOPIFY_API_SECRET']
    url = get_permission_url(shop_url, api_key, secret)
    return redirect(url)

def test_url_joining(self):
        self.assert_strict_equal(urls.url_join('/foo', '/bar'), '/bar')
        self.assert_strict_equal(urls.url_join('http://example.com/foo', '/bar'),
                                 'http://example.com/bar')
        self.assert_strict_equal(urls.url_join('file:///tmp/', 'test.html'),
                                 'file:///tmp/test.html')
        self.assert_strict_equal(urls.url_join('file:///tmp/x', 'test.html'),
                                 'file:///tmp/test.html')
        self.assert_strict_equal(urls.url_join('file:///tmp/x', '../../../x.html'),
                                 'file:///x.html')