to reproduce, open a page that has the symfony profiler, and then in browser devtools javascript console run following:

• fetch("https://symfony.com") works as intended, we get a CORS error.

• fetch(new URL("https://symfony.com")) also gets the CORS error, but also a fatal error url.match is not a function that points to a oneliner added by symfony.

i guess its the symfony profiler assuming the url in fetch is a string...