connect tag not working in Tampermonkey?

Tampermonkey is a versatile browser extension with over ???? million users that enhances your browsing experience by allowing you to run userscripts on websites.

The request ends with an error. No confirmation dialog appears. Refused to connect to http://localhost: Request was blocked by the user.

A file from r2cdn.beatsaver.com returns an error, saying injected: Refused to connect to https://r2cdn.beatsaver.com/***: URL is not a part of the @connect ...

And finally there is another thing that should be mentioned: if a userscript contains a @connect-src statement, then all non-matching request will be denied.

Refer to the documentation for the @connect directive. It takes a domain, not a URL. So your @connect statement(s) would be like: // @connect my_url.com

Apparently when you don't have the @connect tag and that warning dialog comes up, if you don't respond quickly enough it blacklists the URL.

Additionally add @connect * to the script to allow Tampermonkey to offer an Always allow all domains button. Users can also whitelist all requests by adding * ...

Tampermonkey is one of the most popular browser extensions across all major browsers. It's available for Chrome, Microsoft Edge, Safari, Opera Next, ... Userscripts · Firefox · Support · Microsoft Edge

Tampermonkey is a browser extension. A browser extension is a small software program that extends the functionality of a web browser.

This video will show you how to install Tampermonkey from https://www.tampermonkey.net as well as how to use it afterwards.