---
title: Changes to Cart default bundled section rendering (Ajax API) - Shopify developer changelog
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/changes-to-cart-default-bundled-section-rendering-ajax-api
  md: https://shopify.dev/changelog/changes-to-cart-default-bundled-section-rendering-ajax-api.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

November 19, 2021

Tags:

* API

# Changes to Cart default bundled section rendering (Ajax API)

Previously, the Cart API's bundled section rendering operated in the context of `/cart` when no specific `sections_url` parameter was set. Now, when `sections_url` isn't set, sections are rendered in the context of the current page, based on the Referer HTTP request header.

The behavior when `sections_url` is set remains unchanged.

For most themes, this change won't be disruptive. If the section being requested exists in the context of the current page, then using the Referer as the context for rendering, instead of `/cart`, shouldn't present any issues.

For more information on bundled section rendering, refer to the Ajax API's [Cart reference](https://shopify.dev/api/ajax/reference/cart#bundled-section-rendering).