Loopback requests do not work on the local development environment

[johnbillion]

Within the local development environment, loopback requests do not work because localhost:8889 does not resolve. This means the following are broken:

• WP-Cron event spawning
• Theme editor
• Plugin editor
• Multisite network upgrades

The error can be seen on the Site Health screen, by attempting to edit a PHP file with the theme or plugin editor, or by running npm run env:cli cron test. The error is:

cURL error 7: Failed to connect to localhost port 8889: Connection refused

[sandrasanzdev]

Fix loopback requests on local environment

[hasanuzzamanshamim]

I tested with the provided patch by @sandrasanzdev on my local using

npm run env:cli cron test

But still getting the same issue.

Error: WP-Cron spawn failed with error:
cURL error 7: Failed to connect to localhost port 8889: Connection refused

[sandrasanzdev]

Enables loopback requests in php (site) and cli (tests) containers.

[sandrasanzdev]

@hasanuzzamanshamim Thanks for testing :) I saw it fixed in the admin panel and forgot to run the test. Uploaded a fix in 52708-loopback-local-3.diff that passes the test too.

[hasanuzzamanshamim]

Thanks, @sandrasanzdev for the updated patch.
That patch works for me.

[johnbillion]

In 53636:

Build/Test Tools: Enable loopback requests to work on the local development environment.

This maps localhost to the host machine so the requests get routed to the web server container.

Props sandrasanzdev, hasanuzzamanshamim

Fixes #52708