Our previous chapter touched upon config providers and the window.checkoutConfig object; a mechanism by which we can push our server-side data to our storefront when a page loads. The section mechanism allows us to push data to a browser page upon any named HTTP POST request.

Let's take a quick look at the <MAGENTO_DIR>/module-review/etc/frontend/sections.xml file:

<action name="review/product/post">
  <section name="review"/>
</action>

The definition provided here is to be interpreted as: "any storefront HTTP POST review/product/post request is to trigger a review section load," where review section load means Magento triggering an additional AJAX request following the completion of an observed HTTP POST. The result of this section load action, in this case, is the refresh of section...