WordPress Error: "Response to preflight request..."

[ChrisPAR]

Unfortunately, the widget update seems to be running into the security system:

Ensuring only web browsers can access your website

InfinityFree is a website hosting service. That means that the hosting accounts we provided are intended for hosting websites. Websites contain pages that are accessed through web browsers. InfinityFree is not intended to be used for file sharing, API hosting, database hosting or background tasks/tools. To help enforce this, free hosting enforces a security system that makes sure that anyone trying to access your website is using a normal web browser. This is done by checking whether the web br…

An explanation on why this happens is mentioned here:

@Admin

Your site could not complete a loopback request

Some plugins and themes will try to connect back to your website like a visitor, often to scan the content of your website to check for things like configuration issues.

This does not work on InfinityFree. Websites on InfinityFree use a security system that blocks automated access to websites hosted here. This also affects WordPress trying to access it’s own website. Connections like that may result in a 403 Forbidden response, or receiving the HTML code for the security challenge.

Cloudflare can be used to bypass this security for connections from remote sites, but connections from InfinityFree website servers always connect directly to our servers, and do not check the publicly configured DNS settings of your domain.

The REST API encountered an unexpected result

Please see the section “Your site could not complete a loopback request”, the same issue prevents WordPress from interacting with it’s own REST API.