[Bug]: Cart AJAX API returning 404

[nboliver-ventureweb]

Please confirm that you have:

• Searched existing issues to see if your issue is a duplicate. (If you’ve found a duplicate issue, feel free to add additional information in a comment on it.)
• Reproduced the issue in the latest CLI version.

In which of these areas are you experiencing a problem?

Theme

Expected behavior

The AJAX API endpoints cart/add.js and cart/update.js should the dev theme preview available at http://127.0.0.1:9292

Actual behavior

The AJAX API endpoints cart/add.js and cart/update.js are returning 404s when using the dev theme preview at http://127.0.0.1:9292
CLI version 3.66.1 seems to work, but 3.67.1 and 3.68.1 do not.
Using the --legacy flag does not fix the issue.

Request:

http://127.0.0.1:9292 Response:

Same request, same theme, but using the myshopify.com URL:

Verbose output

Can be shared via DM

Reproduction steps

1. Run npm exec --package @shopify/[email protected] -- shopify theme dev --live-reload full-page (or try v3.67.1). Note that we are currently using npm exec because we rely on Shopkeeper, which was broken by CLI versions > 3.58, but the theme dev command is broken in that version. See Move theme utilities to cli-kit #4469
2. Visit http://127.0.0.1:9292 in browser
3. Try to add or update via AJAX API
4. Get a 404 response

Operating System

Mac OS Ventura

Shopify CLI version (check your project's package.json if you're not sure)

3.68.1

Shell

No response

Node version (run node -v if you're not sure)

v22.3.0

What language and version are you using in your application?

No response

[montalvomiguelo]

I was not able to reproduce the issue using the steps provided. Am I missing something?

update-200.mp4