I'm adding a "buy now" button to my site.  I'm using the code from [here][1].

When I click the button, my site tries to go to `example.com/checkout/#93=4`, which then results in it going to `example.com/checkout/noroute`.  Where is the `#93=4` part coming from?  I've tried to step through the Magento code in a debugger, and as far as I can tell, the extension is trying to go to `example.com/checkout/`, and I can't figure out what's adding the `#93=4`.  But I'll be honest; I don't understand Magento's routing.

Here are the parts of the code that I think are relevant:

**buynow.js**

    define([
        'jquery'
    ], function ($) {
        "use strict";
        return function (config, element) {
            $(element).click(function () {
                var form = $(config.form);
                var baseUrl = form.attr('action'),
                buyNowUrl = baseUrl.replace('checkout/cart/add', 'buynow/cart/add');
                form.attr('action', buyNowUrl);
                form.trigger('submit');
                form.attr('action', baseUrl);
                return false;
            });
        }
    });

**Add.php**

*I've used the debugger to verify that the line `$baseUrl = $this->_objectManager->get('\Magento\Store\Model\StoreManagerInterface')->getStore()->getBaseUrl();` towards the bottom of the code does return `example.com/checkout/` (no `#93=4`)*

    class Add extends \Magento\Checkout\Controller\Cart\Add
    {
        /**
         * Add product to shopping cart action
         *
         * @return \Magento\Framework\Controller\Result\Redirect
         * @SuppressWarnings(PHPMD.CyclomaticComplexity)
         */
        public function execute()
        {
            if (!$this->_formKeyValidator->validate($this->getRequest())) {
                return $this->resultRedirectFactory->create()->setPath('*/*/');
            }
    
            $params = $this->getRequest()->getParams();
            try {
                if (isset($params['qty'])) {
                    $filter = new \Zend_Filter_LocalizedToNormalized(
                        ['locale' => $this->_objectManager->get('Magento\Framework\Locale\ResolverInterface')->getLocale()]
                    );
                    $params['qty'] = $filter->filter($params['qty']);
                }
    
                $product = $this->_initProduct();
                $related = $this->getRequest()->getParam('related_product');
    
                if (!$product) {
                    return $this->goBack();
                }
    
                $cartProducts = $this->_objectManager->create('Test\BuyNowButton2\Helper\Data')
                                 ->getConfig('buynow/general/keep_cart_products');
                if (!$cartProducts) {
                    $this->cart->truncate(); //remove all products from cart
                } 
    
                $this->cart->addProduct($product, $params);
                if (!empty($related)) {
                    $this->cart->addProductsByIds(explode(',', $related));
                }
    
                $this->cart->save();
                $this->_eventManager->dispatch(
                    'checkout_cart_add_product_complete',
                    ['product' => $product, 'request' => $this->getRequest(), 'response' => $this->getResponse()]
                );
    
                if (!$this->_checkoutSession->getNoCartRedirect(true)) {
                    $baseUrl = $this->_objectManager->get('\Magento\Store\Model\StoreManagerInterface')
                                ->getStore()->getBaseUrl();
                    return $this->goBack($baseUrl.'checkout/', $product);
                }
            } catch (\Exception $e) {
                // ...
            }
        }
    }

  [1]: https://github.com/mageprince/magento2-buynow